EP1281063A1 - Structure reticulaire de guide d'ondes pour determiner des multi-analytes et son utilisation - Google Patents

Structure reticulaire de guide d'ondes pour determiner des multi-analytes et son utilisation

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Publication number
EP1281063A1
EP1281063A1 EP01901178A EP01901178A EP1281063A1 EP 1281063 A1 EP1281063 A1 EP 1281063A1 EP 01901178 A EP01901178 A EP 01901178A EP 01901178 A EP01901178 A EP 01901178A EP 1281063 A1 EP1281063 A1 EP 1281063A1
Authority
EP
European Patent Office
Prior art keywords
excitation light
light
grating
waveguide structure
coupling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP01901178A
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German (de)
English (en)
Inventor
Michael Pawlak
Markus Ehrat
Gert Duveneck
Martin Bopp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Zeptosens AG
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Filing date
Publication date
Application filed by Zeptosens AG filed Critical Zeptosens AG
Publication of EP1281063A1 publication Critical patent/EP1281063A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/7703—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides
    • G01N21/774—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides the reagent being on a grating or periodic structure
    • G01N21/7743—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides the reagent being on a grating or periodic structure the reagent-coated grating coupling light in or out of the waveguide
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/54366—Apparatus specially adapted for solid-phase testing
    • G01N33/54373—Apparatus specially adapted for solid-phase testing involving physiochemical end-point determination, e.g. wave-guides, FETS, gratings

Definitions

  • the invention relates to variable embodiments of a grating waveguide structure, which makes it possible to change the resonance conditions in a spatially resolved manner in order to couple an excitation light into the waveguiding layer (a) of an optical layer waveguide via a grating structure (c) modulated in the layer (a) or coupling out one in the layer (a) led light, with arrays of measurement areas generated thereon with different immobilized biological or biochemical or synthetic recognition elements for the simultaneous binding and determination of one or more analytes, wherein said excitation light is simultaneously irradiated onto a whole array of measurement areas and the degree of fulfillment of the resonance condition for the coupling of light into the layer (a) to said measuring ranges is measured simultaneously.
  • the invention also relates to an optical system with at least one excitation light source and at least one spatially resolving detector and optionally positioning elements for changing the angle of incidence of the excitation light onto the grating waveguide structure according to the invention, as well as an associated measurement method and its use. It was surprisingly found that the method according to the invention is suitable as an imaging detection method with high spatial resolution and sensitivity.
  • the “spatially resolved” determination of a physical parameter, its distribution over a preferably flat measuring surface to be measured, is to be understood to mean that a corresponding measurement assigns a unique value to this parameter as a function of its x and y coordinates, based on said measuring surface
  • the maximum achievable spatial resolution is limited, for example, by the resolution of the detection system.
  • microtiter plates For the determination of a large number of analytes, above all methods are widespread in which the detection of different analytes in so-called microtiter plates is carried out in discrete sample containers or "wells" of these plates.
  • the most widespread are plates with a grid of 8 x 12 wells on a base area of typically approx. 8 cm x 12 cm, with a volume of a few hundred microliters for filling an individual well is required.
  • US Pat. No. 5,747,274 describes measurement arrangements and methods for the early detection of a heart attack by the determination of several of at least three heart attack markers, the determination of these markers being able to take place in individual or in a common sample container, in the latter case following the description given, a single sample container is designed as a continuous flow channel, the boundary surface of which, for example, forms a membrane on which antibodies for the three different markers are immobilized.
  • a single sample container is designed as a continuous flow channel, the boundary surface of which, for example, forms a membrane on which antibodies for the three different markers are immobilized.
  • no geometric information is given about the size of the measuring areas.
  • a light wave is coupled into an optical waveguide that is made of optically thinner media, i.e. Media with a lower refractive index is surrounded, it is guided by total reflection at the interfaces of the waveguiding layer.
  • a fraction of the electromagnetic energy enters the optically thinner media. This proportion is known as the evanescent or cross-damped field.
  • the strength of the evanescent field is very much dependent on the thickness of the waveguiding layer itself and on the ratio of the refractive indices of the waveguiding layer and the media surrounding it.
  • thin waveguides i.e. H. Layer thicknesses of the same or lower thickness than the wavelength to be guided can be distinguished from discrete modes of the guided light.
  • the first proposed measuring arrangements of this type were based on highly multimodal, self-supporting single-layer waveguides, such as fibers or platelets made of transparent plastic or glass, with thicknesses from a few hundred micrometers to several millimeters.
  • WO 94/27137 measurement arrangements are described in which "patches" with different detection elements, for the detection of different analytes, are immobilized on a self-supporting optical substrate waveguide (single-layer waveguide) with face light coupling, the spatially selective immobilization being carried out by means of photo-activatable crosslinkers.
  • several patches can be arranged in series in common parallel flow channels or sample containers, the parallel flow channels or sample containers extending over the entire length of the region of the waveguide used as a sensor in order to avoid impairment of the light conduction in the waveguide.
  • Planar thin-film waveguides have been proposed to improve sensitivity and, at the same time, simplify mass production.
  • a planar thin-film waveguide consists of a three-layer system: carrier material, waveguiding layer, superstrate (or sample to be examined), the waveguiding layer having the highest refractive index. Additional intermediate layers can improve the effect of the planar waveguide.
  • Different methods for the detection of analytes in the evanescent field of guided light waves in optical layer waveguides can be differentiated.
  • a distinction can be made, for example, between fluorescence or general luminescence methods on the one hand and refractive methods on the other.
  • Methods for generating a surface plasmon resonance in a thin metal layer on a dielectric layer with a lower refractive index can be included in the group of refractive methods, provided that the resonance angle of the irradiated excitation light is used as the basis for determining the measurement variable Surface plasmon resonance is used.
  • the surface plasmon resonance can also be used to enhance luminescence or to improve the signal-to-background ratio in a luminescence measurement.
  • luminescence denotes the spontaneous emission of photons in the ultraviolet to infrared range after optical or non-optical, such as, for example, electrical or chemical or biochemical or thermal excitation.
  • chemiluminescence, bioluminescence, electroluminescence and in particular fluorescence and phosphorescence are included under the term "luminescence”.
  • the change in the so-called effective refractive index due to molecular adsorption or desorption on the waveguide is used to detect the analyte.
  • This change in the effective refractive index in the case of grating coupler sensors, is determined from the change in the coupling angle for the coupling in or out of light into or out of the grating coupler sensor, and in the case of interferometric sensors from the change in the phase difference between the a sensor arm and a reference arm of the interferometer-guided measurement light.
  • US Pat. No. 5,738,825 describes an arrangement consisting of a microtiter plate with completely through holes and a thin-layer waveguide as the bottom plate, the latter consisting of a thin waveguiding film on a transparent, self-supporting substrate, hl contact with the from the pierced microtiter plate and the Diffraction gratings are provided for the coupling in and out of the excitation light in order to determine the responsible changes in the effective refractive index due to adsorption or desorption of analyte molecules to be detected from changes in the observed coupling angle.
  • This arrangement has the advantage above all of a high potential for the miniaturization of the measuring arrangement (including the light source and the spatially resolving detector), since in particular mechanical positioning elements can be dispensed with.
  • the dimensions of the discrete areas of "chirped gratings" for coupling in or out light are difficult to reduce to dimensions smaller than a few square millimeters.
  • the refractive methods mentioned have the advantage that they can be used without the use of additional labeling molecules, so-called molecular labels.
  • using grating couplers for analyte detection by determining changes in the coupling conditions or the coupling angle due to molecular adsorption or desorption from the coupling grating is there an indication of a spatially resolved detection within a light beam irradiated onto a coupling grating. For this reason, these methods have so far not been or only barely suitable for the detection of a large number of analytes in a small space.
  • the object of the present invention is to provide a grating-waveguide structure, an optical system and a measurement method for label-free analyte detection with arrays of high density, for the above-mentioned detection.
  • spatially separated measuring areas (d) are to be defined by the area which is immobilized there biological or biochemical or synthetic detection elements to detect one or more analytes from a liquid sample.
  • These surfaces can have any geometry, for example the shape of points, circles, rectangles, triangles, ellipses or lines. It is possible to generate spatially separate measurement areas (d) by spatially selective application of biological or biochemical or synthetic recognition elements on the grating waveguide structure.
  • these molecules will only selectively bind to the surface of the grating waveguide structure in the measurement areas, which through the areas are defined that are occupied by the immobilized recognition elements.
  • a grating-waveguide structure for example with a grating structure modulated in the waveguiding layer and extending over the entire GWS, in particular with large-area illumination (ie with a beam diameter of, for example, 5 mm) , below or near the resonance condition for the light coupling into the layer (a), differences in the degree of fulfillment of the resonance condition for the light coupling, i.e. local differences in the mass assignment of the lattice structure, in the form of applied measuring areas with biological detection elements such as oligonucleotides high spatial resolution (of 50 ⁇ m or less) and with a high contrast, ie a high sensitivity for determining differences or changes in the mass occupancy.
  • biological detection elements such as oligonucleotides high spatial resolution (of 50 ⁇ m or less) and with a high contrast, ie a high sensitivity for determining differences or changes in the mass occupancy.
  • the method according to the invention is even suitable as an imaging method (simultaneous topological characterization of the mass coverage of an extensive surface (in the order of magnitude of several square millimeters to several square centimeters), for example for Determination of different local mass assignments sequentially camera images (for example in transmission or in "reflection") are recorded, between each of which the angle of incidence of the excitation light on the GWS is changed, so that depending on the local mass assignment at different angles, minima in the transmission or Result in maxima in the "reflection". These sequential images can then be replaced by numerical ones Procedure to determine the spatially resolved distribution of the mass occupancy.
  • the new method according to the invention has a number of advantages. These relate to a much higher speed, for example, since sequential images can be created every fraction of a second with milliseconds exposure time. Furthermore, there are no reproducibility problems in the positioning if the GWS has to be moved to these new measuring positions between sequential local measurements at discrete measurement areas, as is necessary when using the conventional methods mentioned. Furthermore, the method advantageously also enables simultaneous kinetic measurements to be carried out for a large number of measurement areas within a common sample container on the GWS, in that “angle scans” can be repeated in a short sequence to determine different mass occupancy on the observed surface.
  • the first object of the invention is a grating-waveguide structure for the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into a waveguide or coupling out a light guided in the waveguide with an array of at least two or more spatially separated measuring areas (d) on this platform comprising an optical layer waveguide
  • Identical or different biological or biochemical or synthetic recognition elements immobilized on these measurement areas for the qualitative and / or quantitative detection of one or more analytes in a sample brought into contact with the measurement areas, characterized in that said excitation light simultaneously on said array of Measuring ranges is irradiated and the degree of fulfillment of the resonance condition for the Coupling of light into layer (a) to the two or more measuring areas is measured simultaneously and crosstalk of excitation light carried in layer (a) from one measuring area to one or more adjacent measuring areas is prevented by decoupling this excitation light by means of the grating structure (c).
  • the grating-waveguide structure it is possible to simultaneously determine the mass occupancy in a plurality of measurement areas on a grating structure (c) in a spatially resolved manner, on the basis of the degree of fulfillment of the resonance condition for the coupling of an excitation light bundle into the optical layer (a) in Range of these measurement ranges.
  • the invention therefore in particular relates to a grating-waveguide structure for the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into a waveguide or coupling out a light guided in the waveguide with a two-dimensional array of at least four or more, spatially separated measuring areas (d) this platform, comprising an optical layer waveguide
  • Identical or different biological or biochemical or synthetic recognition elements immobilized on these measurement areas for the qualitative and / or quantitative detection of one or more analytes in a sample brought into contact with the measurement areas, characterized in that the density of the measurement areas is on a common grid structure (c) is at least 10 measurement areas per square centimeter and that said excitation light is simultaneously irradiated onto said array of measurement areas and the degree to which the resonance condition for the light coupling into the layer is fulfilled (a) to said measurement areas is measured simultaneously and crosstalk from in the layer (a) guided excitation light from one measurement area to one or more adjacent measurement areas is prevented by decoupling this excitation light by means of the grating structure (c). It is preferred that a continuously modulated grating structure (c) extends essentially over the entire area of the grating waveguide structure.
  • Preferred embodiments of the grating-waveguide structure according to the invention are preferred, which are characterized in that the spatial resolution for determining the degree of fulfillment of the resonance condition for the coupling of light into layer (a) is better than 200 ⁇ m. Embodiments are particularly preferred in which the spatial resolution for determining the degree of fulfillment of the resonance condition for the coupling of light into the layer (a) is better than 20 ⁇ m.
  • the grating depth is an essential parameter for changing the local resolution or the sensitivity for determining changes in the mass occupancy based on corresponding changes in the resonance conditions for the light coupling.
  • the grating waveguide structure according to the invention makes it possible for the spatial resolution to determine the degree of fulfillment of the resonance condition for the light coupling into the layer (a) to be improved by choosing a greater modulation depth of grating structures (c) or to reduce the selection of a smaller modulation depth of said grating structures can be. It is also possible that the half-width of the resonance angle to meet the resonance condition for the light coupling into the layer (a) can be reduced by reducing the modulation depth of grating structures (c) or increased by increasing the modulation depth of said grating structures.
  • the spatial resolution or sensitivity for determining changes in the effective refractive index on the surface of the grating waveguide structure according to the invention can be decisively influenced by choosing between transversely magnetically polarized modes (TM) and transversely electrically polarized modes.
  • TM modes in the case of highly refractive waveguiding layers (a) (e.g. with refractive index> 2), which due to their small layer thickness (e.g. between 100 nm and 400 nm) only the basic modes of an irradiated excitation light (TMo or TE 0 , see also below) in a lattice structure area of a lattice waveguide structure (e.g.
  • the spatial resolution using TM modes is lower.
  • the resolution of the signal intensity, ie sensitivity, for determining the extent to which the resonance conditions for TM modes are met is greater. Accordingly, the decision between the use of TM or TE modes must be made depending on the task at hand.
  • an array of measurement areas to be examined simultaneously has a size of at least 2 mm x 2 mm.
  • Coupled angle a monochromatic excitation light
  • a monochromatic excitation light within such an area, ie within an area of at least 4 mm 2 (with the sides aligned in parallel or not) varies parallel to the lines of the lattice structure (c)) by at most 0.1 ° (as a deviation from an average value.
  • the coupling angle on a surface of at least 10 mm x 10 mm (with the sides aligned parallel or not parallel to the lines of the lattice structure (c)) varies by at most 0.1 ° (as a deviation from an average). It is particularly preferred if the coupling angle on a surface of at least 50 mm x 50 mm (with the sides aligned parallel or not parallel to the lines of the Grid structure (c)) varied by at most 0.1 ° * (as a deviation from an average). A large number of macroscopic changes in the external conditions have an influence on the said resonance conditions.
  • the refractive indices of the optically transparent layers (a) and (b) and of samples brought into contact with the grating-waveguide structure change when the temperature changes. It is therefore preferred that the temperature of a grating-waveguide structure according to the invention can be kept constant by suitable precautions or can be changed and adjusted in a controlled manner.
  • An object of the invention is an embodiment of a grating waveguide structure, which is characterized in that the degree of fulfillment of the resonance condition for the coupling of light into the layer (a) to the measuring areas from the intensity of the, essentially parallel to the reflected light, decoupled excitation light (ie from the sum of both parts) is determined.
  • Another embodiment is characterized in that the degree of fulfillment of the resonance condition for the light coupling into the layer (a) to the measurement areas is determined from the intensity of the transmitted excitation light.
  • a further embodiment is characterized in that the degree of fulfillment of the resonance condition for the coupling of light into the layer (a) to the measuring ranges is determined from the intensity of the scattered light of excitation light guided after coupling via a grating structure (c) in the layer (a) ,
  • the grating-waveguide structure according to the invention is characterized in that the sum of the intensities of the reflected excitation light and the excitation light which is essentially coupled out again in parallel has a maximum in the region of this measuring range when the resonance condition for the coupling of light into the layer (a) is fulfilled.
  • the excitation light that is coupled out to one and the same measuring range and reflected there cannot be distinguished from one another, since both propagate from the same location in the same direction.
  • the intensity of the transmitted excitation light has a minimum in the region of this measuring range when the resonance condition for the coupling of light into the layer (a) is fulfilled.
  • the intensity of the scattered light of excitation light guided in the layer (a) after coupling via a grating structure (c) has a maximum in the region of this measuring range when the resonance condition for the light coupling into the layer (a) is fulfilled.
  • the extent of the propagation losses of a mode guided in an optically wave-guiding layer (a) is determined to a large extent by the surface roughness of an underlying carrier layer and by absorption by chromophores which may be present in this carrier layer, which additionally increases the risk of excitation of luminescence which is undesirable for many applications in this carrier layer, by penetration of the evanescent field of the mode carried in layer (a). Furthermore, thermal stresses may occur as a result of different coefficients of thermal expansion of the optically transparent layers (a) and (b).
  • a chemically sensitive, optically transparent layer (b) provided that it consists, for example, of a transparent thermoplastic, it is desirable to prevent solvents, which could attack the layer (b), from penetrating through the optically transparent layer (a). to prevent existing micropores.
  • optically transparent layer (b ') with a lower refractive index than that of layer (a) and a thickness between the optically transparent layers (a) and (b) and in contact with layer (a) from 5 nm to 10,000 nm, preferably from 10 nm to 1000 nm.
  • the function of the intermediate layer is to reduce the surface roughness under layer (a) or to reduce the penetration of the evanescent field of light guided in layer (a) into the one or more layers below or to improve the adhesion of layer (a) the one or more underlying layers or the reduction of thermally induced voltages within the grating-waveguide structure or the chemical isolation of the optically transparent layer (a) from underlying layers by sealing micropores in the layer (a) against underlying layers ,
  • the grating structure (c) of the grating-waveguide structure according to the invention can be a diffractive grating with a uniform period or a multi-diffractive grating. It is also possible for the grating structure (c) to have a periodicity that varies spatially perpendicular or parallel to the direction of propagation of the excitation light coupled into the optically transparent layer (a).
  • the material of the second optically transparent layer (b) of the grating waveguide structure according to the invention consists of glass, quartz or a transparent thermoplastic or sprayable plastic, for example from the group formed by polycarbonate, polyimide or polymethyl methacrylate.
  • the refractive index of the first optically transparent layer (a) is greater than 1.8.
  • a large number of materials are suitable for the optical layer (a).
  • the first optically transparent layer (a) be a material from the group of TiO 2 , ZnO, Nb 2 O 5 , Ta 2 O 5 , HfO 2 , or ZrO 2 , particularly preferably made of TiO or Nb 2 O 5 or Ta 2 O 5 .
  • the thickness of the wave-guiding optically transparent layer (a) is the second relevant parameter for generating the strongest possible evanescent field at its interfaces with neighboring layers with a lower refractive index and the highest possible energy density within the layer (a).
  • the strength of the evanescent field increases with decreasing thickness of the waveguiding layer (a), as long as the layer thickness is sufficient to lead at least one mode of the excitation wavelength.
  • the minimum “cut-off” layer thickness for guiding a mode depends on the wavelength of this mode. It is larger for longer-wave light than for short-wave light. However, as the "cut-off" layer thickness is approached, undesired propagation losses also increase sharply to what further limits the choice of preferred layer thickness.
  • layer thicknesses of the optically transparent layer (a) which only allow the guidance of 1 to 3 modes of a predetermined excitation wavelength
  • layer thicknesses which lead to monomodal waveguides for this excitation wavelength are very particularly preferred.
  • the discrete mode character of the guided light only refers to the transverse modes.
  • the resonance angle for the coupling of the excitation light in accordance with the above-mentioned resonance condition depends on the diffraction order to be coupled in, the excitation wavelength and the grating period.
  • the first diffraction order is advantageous.
  • the grating depth is decisive for the level of the coupling efficiency. In principle, the coupling efficiency increases with increasing grid depth.
  • the grating (c) has a period of 200 nm - 1000 nm and the modulation depth of the grating (c) is 3 to 100 nm, preferably 10 to 30 nm.
  • the ratio of the modulation depth to the thickness of the first optically transparent layer (a) is equal to or less than 0.2.
  • the so-called “web-to-groove ratio” also has an effect on the coupling-in and coupling-out efficiency.
  • the web-to-groove ratio for example in a rectangular grid, the ratio of the width of the webs to the width is of the grooves
  • the grids preferably have a web-to-groove ratio of 0.5-2.
  • the grating structure (c) can be a relief grating with a rectangular, triangular or semicircular profile or a phase or volume grating with a periodic modulation of the refractive index in the essentially planar optically transparent layer (a).
  • optically or mechanically recognizable markings on the grating waveguide structure to facilitate the adjustment in an optical one System and / or for connection to sample containers are applied as part of an analytical system.
  • the grating waveguide structure according to the invention is particularly suitable for use in biochemical analysis, for the highly sensitive detection of one or more analytes in one or more samples supplied.
  • the following group of preferences is particularly geared towards this area of application.
  • biological or biochemical or synthetic recognition recognition elements for the recognition and binding of analytes to be detected are immobilized on the grating waveguide structure. This can be done over a large area, possibly over the entire structure, or in discrete so-called measurement areas.
  • spatially separated measuring areas (d) are to be defined by the area occupied by biological or biochemical or synthetic recognition elements immobilized there for recognizing one or more analytes from a liquid sample.
  • These surfaces can have any geometry, for example the shape of points, circles, rectangles, triangles, ellipses or lines. It is possible that in a 2-dimensional arrangement up to 1,000,000 measuring areas are arranged on a grating waveguide structure according to the invention, with a single measuring area taking up an area of 0.001 mm - 6 mm, for example.
  • the density of measurement areas on a common grid structure (c) can be more than 10, preferably more than 100, particularly preferably more than 1000 measurement areas per square centimeter.
  • the outside dimensions of their base correspond to the base of standard microtiter plates of approximately 8 cm ⁇ 12 cm (with 96 or 384 or 1536 wells).
  • an adhesion-promoting layer (f) is applied to the optically transparent layer (a) for the immobilization of biological or biochemical or synthetic recognition elements (e).
  • This adhesive layer should also be optically transparent.
  • the adhesive layer should not protrude beyond the depth of penetration of the evanescent field from the wave-guiding layer (a) into the medium above. Therefore, the adhesion promoting layer (f) should have a thickness of less than 200 nm, preferably less than 20 nm.
  • it can include chemical compounds from the group consisting of silanes, epoxides, functionalized, charged or polar polymers and "self-organized functionalized monolayers".
  • one or more methods from the group of methods can be used, from inkjet spotting, mechanical spotting, micro contact printing, fluidic contacting of the measurement areas with the biological or biochemical or synthetic recognition elements by their supply in parallel or crossed microchannels, under the influence of pressure differences or electrical or electromagnetic potentials ".
  • nucleic acids for example DNA, RNA, oligonucleotides
  • nucleic acid analogs for example PNA
  • antibodies aptamers
  • membrane-bound and isolated receptors their ligands
  • the latter type of recognition elements are understood to mean cavities which are produced in a process which has been described in the literature as "molecular imprinting".
  • the analyte or an analogue of the analyte is encapsulated in a polymer structure. It is then called the “imprint”.
  • the analyte or its analogue is removed from the polymer structure with the addition of suitable reagents, so that it leaves an empty cavity there. This empty cavity can then be used as a binding site with high steric selectivity in a later detection method.
  • the detection limit of an analytical method is limited by signals of so-called non-specific binding, i.e. H. by signals which are generated by binding the analyte or other compounds used for the detection of the analyte, which are bound not only in the area of the immobilized biological or biochemical or synthetic recognition elements used, but also in areas of a grating waveguide structure uncovered therefrom, for example by hydrophobic adsorption or by electrostatic interactions. It is therefore advantageous if "chemically neutral" compounds are applied between the spatially separated measuring areas (d) to the analyte to reduce non-specific binding or adsorption.
  • “Chemically neutral” compounds are substances which do not themselves have any specific binding sites for the detection and binding of the analyte or an analogue of the analyte or another binding partner in a multi-stage assay and which, due to their presence, give access to the analyte or its analogue or block another binding partner to the surface of the grating waveguide structure.
  • substances from the groups can be used, for example, of albumin, in particular bovine serum albumin or human serum albumin, of fragmented natural or synthetic DNA that does not hybridize with polynucleotides to be analyzed, such as herring or salmon sperm, or also uncharged but hydrophilic Polymers, such as polyethylene glycols or dextrans, are formed.
  • albumin in particular bovine serum albumin or human serum albumin
  • fragmented natural or synthetic DNA that does not hybridize with polynucleotides to be analyzed, such as herring or salmon sperm
  • polynucleotides to be analyzed such as herring or salmon sperm
  • uncharged but hydrophilic Polymers such as polyethylene glycols or dextrans
  • Another object of the invention is an optical system for the spatially resolved determination of changes in the resonance conditions for coupling an excitation peak into a waveguide or coupling out a light guided in the waveguide with an array of at least two or more spatially separated measuring ranges (d) on this platform
  • At least one spatially resolving detector for detecting the transmitted excitation light on the opposite side of the grating waveguide structure with respect to the irradiated excitation light and / or for detecting the light coupled out again essentially parallel to the reflected light on the same with respect to the irradiated excitation light Side of the grating-waveguide structure and / or for detecting the scattered light of excitation light guided after coupling via a grating structure (c) in the layer (a).
  • the surface of the optically transparent layer (b) facing away from the waveguiding layer (a), i.e. the opposite side of the grating-waveguide structure with respect to the incident excitation light is provided with an anti-reflection coating. Possible interference reflections and interference phenomena, for example as a result of Fresnel reflections, which can occur independently of the measurement signals to be detected, can hereby be reduced.
  • the boundary conditions listed for the positioning of the at least one spatially resolving detector on the same or opposite side of the grating waveguide structure, with respect to the incident excitation light and depending on the light component to be detected (transmitted excitation light or, coupled out again, excitation light parallel to the reflected component) can be simplified are achieved through the use of a projection screen that can be positioned in the beam path.
  • a suitable projection screen should be diffusely reflective and / or diffusely transmissive.
  • the completeness of the material, especially its surface, plays an important role in the selection of materials. A too coarse granularity leads to a decrease in contrast and to the creation of enlarged, blurred contours, ie to a decrease in spatial resolution and sensitivity.
  • a piece of fine-grained, white paper proves to be a well-suited diffusely reflecting projection wall, which, for detecting the transmitted excitation light, has to be positioned on the opposite side of the grating-waveguide structure with respect to the irradiated excitation light.
  • the at least one spatially resolving detector is arranged on the same side of the grating waveguide structure with respect to the irradiated excitation light.
  • the detector can be arranged on both sides of the grating-waveguide structure.
  • Such a projection screen can also be used advantageously for detecting the light that is coupled out again essentially parallel to the reflected light. While, without using such a projection wall, a spatially resolving detector must be positioned exactly in the direction of propagation of this light component, which can lead to difficulties in practical implementation due to the spatial dimensions of such a detector, these requirements are eliminated when using said projection wall.
  • the distance between the projection wall and the grating-waveguide structure can be varied over a wide range without significantly affecting the sensitivity and / or the spatial resolution.
  • the wave-guiding layer (a) a side of a suitable sample container opposite a grating-waveguide structure, with the grating-waveguide structure as the opposite boundary wall, being designed as a projection wall.
  • Another object of the invention is therefore an optical system for the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into a waveguide or coupling out a light guided in the waveguide with an array of at least two or more spatially separated measuring ranges (d) on this platform,
  • a possible embodiment is characterized in that the at least one spatially resolving detector for detecting the image of the transmitted excitation light is arranged on said projection wall on the same side of the grating waveguide structure with respect to the irradiated excitation light.
  • an embodiment of an optical system with a grating-waveguide structure with one or more grating structures (c) with a periodicity which varies spatially varying essentially perpendicular to the direction of propagation of the excitation light coupled into the optically transparent layer (a) is preferred, which thereby is characterized in that at most one measuring range is arranged on each grating structure (c) with a periodicity that varies spatially perpendicular to the direction of propagation of the excitation light coupled into the optically transparent layer (a), with the grating waveguide structure in the direction of propagation of the to be coupled in and an unstructured region of the grating-waveguide structure is connected in the layer (a) to be guided, and if necessary a further grating structure (c) is connected to this further in the direction of propagation of the excitation light guided in the layer (a), via which said guided excitation light is coupled out again in the direction of a spatially resolving detector.
  • Such an embodiment can be designed in such a way that changes in the mass occupancy, or more generally in the local effective refractive index, by adsorption or desorption of molecules from the measurement areas on lattice structures (c) lead to a shift in the local position of the fulfillment of the resonance condition for coupling the excitation light into the Guide layer (a) over said lattice structure (c) essentially parallel to the lattice lines.
  • Such an embodiment of the optical system according to the invention is preferred, which is characterized in that a one-dimensional arrangement of at least 2 grating structures (c) of the embodiment just mentioned is simultaneously irradiated with excitation light. It is further preferred that the excitation light is radiated essentially in parallel and is essentially monochromatic.
  • the excitation light is irradiated in a linearly polarized manner to excite a TE 0 or TMo mode carried in layer (a).
  • a larger number of such lattice structures is advantageously irradiated simultaneously, for example a two-dimensional arrangement of at least 4 such lattice structures.
  • the invention therefore furthermore relates to an optical system for the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into a waveguide or coupling out a light guided in the waveguide with a two-dimensional array of at least four or more, spatially separated measurement areas (d) on this platform,
  • At least one spatially resolving detector for detecting the transmitted excitation light on the opposite side of the grating waveguide structure with respect to the irradiated excitation light and / or for detecting the light coupled out again essentially parallel to the reflected light on the same with respect to the irradiated excitation light Side of the grating-waveguide structure and / or for detecting the scattered light of excitation light guided after coupling via a grating structure (c) in the layer (a).
  • the boundary conditions listed can relate to the positioning of the at least one spatially resolving detector on the same or opposite side of the grating waveguide structure, with regard to the incident excitation light and depending on the light component to be detected (transmitted excitation light or, parallel to the reflected component excitation light) can be simplified by the use of a projection wall which is suitably positioned in the beam path.
  • Another object of the invention is thus an optical system for the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into a waveguide or coupling out a light guided in the waveguide with a two-dimensional array of at least four or more spatially separated measuring areas (d) on this platform ,
  • At least one excitation light source an inventive grating-waveguide structure, a positioning element for changing the angle of incidence of the excitation light onto the grating-waveguide structure
  • a preferred embodiment consists of an optical system for the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into a waveguide or coupling out a light guided in the waveguide with an array of at least two or more, spatially separated measuring ranges (d) on this platform, with at least one tunable over a certain spectral range
  • At least one spatially resolving detector for detecting the transmitted excitation light and / or for detecting the light coupled out again essentially parallel to the reflected light on the same side of the grating waveguide structure and / or for the incident excitation light Detection of the scattered light from excitation light guided after coupling via a grating structure (c) in the layer (a).
  • a change in the coupling angle or the wavelength of an irradiated excitation light for a specific structure.
  • a change in Coupling angle by 0.2 ° corresponds to a change of a wavelength to be coupled in by 1 nm for transversely electrically polarized light to be coupled in.
  • the resulting change in the coupling angle when a complete protein monolayer is applied is of a similar order of magnitude.
  • said at least one tunable light source can be tuned over a spectral range of at least 1 nm.
  • said at least one tunable light source can be tuned over a spectral range of at least 5 nm.
  • Said at least one tunable light source can be, for example, a laser diode.
  • Another possible alternative is that instead of a monochromatic light source that can be tuned over a certain spectral range, a light source that is polychromatic over the corresponding spectral range, if possible with a spectrum that is continuous within this range, is used.
  • a polychromatic light source that is polychromatic over the corresponding spectral range, if possible with a spectrum that is continuous within this range.
  • the invention therefore furthermore relates to an embodiment of an optical system for the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into a waveguide or coupling out a light guided in the waveguide with an array of at least two or more spatially separated measuring areas (d) on this platform , with at least one polychromatic in a certain spectral range
  • said at least one polychromatic light source has an emission bandwidth of at least 1 nm. It is particularly advantageous if said at least one polychromatic light source has an emission bandwidth of at least 5 nm.
  • Such an embodiment of an optical system according to the invention with a polychromatic light source is preferred, which is characterized in that a spectrally selective optical component with high spectral resolution in said certain spectral range is arranged in the beam path between the grating waveguide structure and the at least one spatially resolving detector is. It is advantageous if said spectrally selective component is suitable for generating spectrally selective, spatially resolved, two-dimensional representations of the intensity distributions of the Grating-waveguide structure outgoing measuring light at different wavelengths within said certain spectral range.
  • Such an embodiment of an optical system according to the invention with a polychromatic light source within a certain spectral range is particularly preferred, which is characterized in that the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into the layer (a) or coupling out a light guided in the waveguide, of said polychromatic light source in the area of the measuring ranges, by simultaneous or sequential detection of the transmitted excitation light and / or by simultaneous or sequential detection of the light, which is essentially coupled out again parallel to the reflected light, on the same side of the grating waveguide with respect to the irradiated excitation light Structure and / or by simultaneous or sequential detection of the scattered light from excitation light guided in the layer (a) after coupling via a grating structure (c) by means of said certain spectral range of spectrally selective detection using at least one spatially resolving detector, preferably at a constant angle of incidence of this excitation light onto the grating waveguide structure.
  • the excitation light is radiated essentially in parallel.
  • An “essentially parallel” light beam should be understood to mean that its convergence or divergence is less than 1 °. Accordingly, “essentially orthogonal” or “essentially normal” should mean a deviation from a corresponding orthogonal or normal orientation of less than 1 ° mean.
  • the excitation light is irradiated essentially monochromatically.
  • An “essentially monochromatic” excitation light should be understood to mean that its spectral bandwidth is less than 1 nm.
  • the excitation light is irradiated in a linearly polarized manner to excite a TE 0 or TMo mode carried in layer (a).
  • the invention relates to such an embodiment of an optical system, which is characterized in that the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into the layer (a) or coupling out a light guided in the waveguide, in the area of the measurement areas by sequential detection of the transmitted excitation light and / or by sequential detection of the light which is essentially coupled out again parallel to the reflected light on the same side of the grating-waveguide structure with respect to the incident excitation light and / or by sequential detection of the scattered light from after coupling in via a grating structure ( c) excitation light carried in layer (a), each with one or more spatially resolving detectors, changing the angle of incidence of the excitation light onto the grating waveguide structure.
  • Another preferred embodiment of an optical system according to the invention is characterized in that the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into the layer (a) or coupling out a light guided in the waveguide, in the area of the measuring ranges , by sequential detection of the transmitted excitation light and / or by sequential detection of the light coupled out again essentially parallel to the reflected light on the same side of the grating-waveguide structure with respect to the incident light and / or by sequential detection of the scattered light from after coupling via a grating structure (c) in the layer (a) guided excitation light with one or more spatially resolving detectors each
  • the emission wavelength of a tunable light source is changed, preferably at a constant angle of incidence of this excitation light onto the grating waveguide structure.
  • the excitation light from at least one light source with an expansion lens is expanded as homogeneously as possible to form a substantially parallel beam and is irradiated onto the one or more measurement areas. It is advantageous if the diameter of the irradiated excitation light bundle is at least in one dimension at least 2 mm, preferably at least 10 mm.
  • Another preferred embodiment is characterized in that the excitation light from the at least one light source through one or, in the case of several light sources, optionally a plurality of diffractive optical elements, preferably Dammann grids, or refractive optical elements, preferably microlens arrays, into a multiplicity of Individual beams of the same intensity as possible of the partial beams originating from a common light source are broken down, each of which is radiated essentially parallel to one another onto grating structures (c) at the resonance angle for coupling into layer (a).
  • a plurality of diffractive optical elements preferably Dammann grids, or refractive optical elements, preferably microlens arrays
  • an optical system is characterized in that the excitation light is expanded by at least one, preferably monochromatic, light source with beam shaping optics to form a beam which is as homogeneous as possible and has a columnar cross section (in a plane perpendicular to the optical axis of the beam path), the main axis of which is parallel is aligned with the grating lines, the partial beams of said beam bundle being substantially parallel to one another in a projection plane parallel to the plane of the grating waveguide structure, while said beam bundle is converging or diverging in a plane orthogonal to the plane of the grating waveguide structure a certain convergence or Has divergence angles.
  • the excitation light is expanded by at least one, preferably monochromatic, light source with beam shaping optics to form a beam which is as homogeneous as possible and has a columnar cross section (in a plane perpendicular to the optical axis of the beam path), the main axis of which is parallel is aligned with the grating lines,
  • said convergence or divergence angle of said beam has a value of up to 5 ° in a plane orthogonal to the plane of the grating waveguide structure. It is particularly preferred that said convergence or divergence angle of said beam has a value of up to 1 ° in a plane orthogonal to the plane of the grating-waveguide structure.
  • Such an optical system according to the invention is characterized in that the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into the layer (a) or coupling out a light guided in the waveguide, in the area of the measuring areas, within a slit-shaped illuminated area according to the above embodiment by simultaneous Detection of the transmitted excitation light and / or by simultaneous detection of the light coupled out again essentially parallel to the reflected light on the same side of the grating-waveguide structure with respect to the incident excitation light and / or by simultaneous detection of the scattered light from after coupling in via a grating structure (c) excitation light carried in layer (a), each with one or more spatially resolving detectors, the local change in the resonance conditions in a measuring range changing in a shift in the M the maximum of the light emanating from said measuring range essentially parallel to the reflected light and the maximum of the scattered light emanating from said measuring range after coupling via a grating structure (c) in the excitation light guided in layer (a) and
  • Such an optical system is also characterized in that the extent of the changes in said resonance conditions and thus the changes in the effective refractive index in the area of said measuring range can be determined from the magnitude of said shift of the minimum or maximum.
  • two or more coherent light sources with the same or different emission wavelength are used as excitation light sources.
  • such an embodiment of the optical system is preferred, which is characterized in that the excitation light from 2 or more light sources is irradiated simultaneously or sequentially from different directions onto a grating structure (c) and via this is coupled into the layer (a) of the grating-waveguide structure, which comprises a superposition of grating structures with different periodicity.
  • At least one spatially resolving detector is used for the detection, for example from the group formed by CCD cameras, CCD chips, photodiode arrays, avalanche diode arrays, multichannel plates and multichannel photomultipliers.
  • the optical system comprises those embodiments which are characterized in that optical components are formed between the one or more excitation light sources and the grating-waveguide structure according to the invention and / or between said grating-waveguide structure and the one or more detectors the group are used by lenses or lens systems for shaping the transmitted light bundles, planar or curved mirrors for deflecting and, if necessary, additionally for shaping light bundles, prisms for deflecting and optionally for spectrally dividing light bundles, dichroic mirrors for spectrally selective deflecting parts of Bundles of light, neutral filters for regulating the transmitted light intensity, optical filters or monochromators for spectrally selective transmission of parts of bundles of light or polarization-selective elements for the selection of discrete polarisates directions of excitation or luminescent light are formed.
  • the radiation of the excitation light occurs in pulses with a duration between 1 fsec and 10 minutes and that the emission light from the measuring ranges is measured in a temporally resolved manner.
  • the binding of one or more analytes to the detection elements in the different measurement areas can also be observed in real-time in a spatially resolved manner with such embodiments.
  • the respective binding kinetics can be determined from the time-resolved signals. In particular, this enables, for example, the comparison of the affinities of different ligands for a respective immobilized biological or biochemical or synthetic recognition element be determined.
  • any binding partner of such an immobilized recognition element is to be referred to as “ligand”.
  • the excitation light can be irradiated and the emission light to be detected sequentially from one or more measurement areas for individual or more measurement areas. This can be achieved in particular by sequential excitation and detection using movable optical components which are formed from the group of mirrors, deflection prisms and dichroic mirrors.
  • Such an optical system is also part of the invention, which is characterized in that sequential excitation and detection takes place using an essentially angle and focus-accurate scanner. It is also possible that the grating waveguide structure is moved between steps of sequential excitation and detection.
  • Another component of the invention is an optical system for the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into a waveguide or coupling out a light guided in the waveguide with an array of at least two or more spatially separated measuring ranges (d) on this platform for detection one or more analytes in at least one sample on one or more measurement areas on a grating waveguide structure, with
  • Feeding means to bring the one or more samples into contact with the measurement areas on the grating waveguide structure.
  • optical system supplemented by the feed means is also referred to below as the analytical system.
  • the analytical system additionally comprises one or more sample containers, which at least in the range of the one or more measuring ranges or the Segments summarized measuring areas are open to the grating-waveguide structure, the sample containers preferably each having a volume of 0.1 nl - 100 ⁇ l.
  • the temperature of an analytical system according to the invention can be kept constant by suitable precautions or can be changed and adjusted in a controlled manner.
  • This preferred possibility for temperature control and regulation comprises, in addition to a grating-waveguide structure according to one of the above-mentioned embodiments, also said sample containers, their feeds or supply lines and, if appropriate, existing storage containers for samples and / or reagents and, if appropriate, their storage locations before application in the analytical or optical system according to the invention.
  • a possible embodiment of the analytical system according to the invention is that the sample containers on the side facing away from the optically transparent layer (a) are closed, with the exception of inlet and / or outlet openings for the supply or outlet of the samples and possibly additional reagents and the supply or discharge of samples and, if necessary, additional reagents take place in a closed flow system, wherein in the case of the liquid supply to several measurement areas or segments with common inlet and outlet openings, these are preferably addressed in columns or rows.
  • sample containers have openings on the side facing away from the optically transparent layer (a) for locally addressed addition or removal of the samples or other reagents.
  • a further development of the analytical system according to the invention is designed such that containers are provided for reagents which are wetted during the method for the detection of the one or more analytes and brought into contact with the measurement areas
  • Another object of the invention is a method for the qualitative and / or quantitative detection of one or more analytes in one or more samples on at least two or more, spatially separated measurement areas on a grating waveguide structure according to the invention according to one of the aforementioned embodiments Determination of changes in the resonance conditions for coupling an excitation light into a waveguide with an array of at least two or more spatially separated measuring areas (d) on this platform, characterized in that the excitation light from at least one excitation light source onto a grating structure (c) with thereon said measuring ranges is guided and the degree of fulfillment of the resonance condition for the light coupling into the layer (a) to said measuring ranges from the signal from at least one spatially resolving detector for detecting the transmitted excitation light on the opposite side of the grating waveguide with respect to the irradiated excitation light Structure and / or for detecting the light coupled out again essentially parallel to the reflected light on the same side of the grating waveguide structure with respect to the irradi
  • the invention also relates to a method for the qualitative and / or quantitative detection of one or more analytes in one or more samples on at least two or more, spatially separated measurement areas on a grating waveguide structure according to the invention according to one of the aforementioned embodiments in an optical system according to the invention , by determining changes in the resonance conditions for coupling an excitation light into a waveguide or coupling out a light guided in the waveguide, with an array of at least two or more, spatially separated measurement areas (d) on this grating-waveguide structure, characterized in that the Excitation light is directed from at least one excitation light source onto a lattice structure (c) with said measuring areas located thereon and the degree of fulfillment of the resonance condition for the light coupling into layer (a) to said measuring areas from the sign al from at least one spatially resolving detector for detecting the transmitted excitation light and / or for detecting the light which is coupled out again essentially parallel to the reflected light on the same side of the grating waveguide structure and
  • Another object of the invention is a method for the qualitative and / or quantitative detection of one or more analytes in one or more samples on at least two or more, spatially separated measurement areas on a grating waveguide structure with a substantially perpendicular to the direction of propagation in the Optically transparent layer (a) coupled in excitation light with spatially varying periodicity, characterized in that a maximum of one measuring range is arranged on each grating structure (c) with a periodically varying excitation light coupled in substantially perpendicular to the direction of propagation of the excitation light into the optically transparent layer (a), whereby an unstructured region of the grating-waveguide structure adjoins the grating-waveguide structure in the direction of propagation of the excitation light to be coupled in and guided in layer (a), and if necessary further in the direction of propagation of the in The layer (a) guided excitation light is followed by a further grating structure (c), via which said guided excitation light is coupled out again in the direction of a spatially resolv
  • Such a method is characterized in that changes in the local effective refractive index, in particular the mass occupancy by adsorption or desorption of molecules from the measurement areas on lattice structures (c), shift the local position of the fulfillment of the resonance condition for coupling the excitation light into the layer ( a) lead over said grid structure (c) substantially parallel to the grid lines.
  • a one-dimensional arrangement of at least 2 such lattice structures (c) is simultaneously irradiated with excitation light.
  • the excitation light is radiated essentially in parallel and is essentially monochromatic. It is advantageous if the excitation light is irradiated in a linearly polarized manner to excite a TE 0 or TM 0 mode carried in layer (a). It is particularly preferred if a two-dimensional arrangement of at least 4 such lattice structures (c) is simultaneously irradiated with excitation light.
  • the invention also relates to a method for the qualitative and / or quantitative detection of one or more analytes in one or more samples on at least two or more, spatially separated measurement areas on a grating-waveguide structure according to the invention, by determining changes in the resonance conditions for coupling an excitation light in a waveguide with a two-dimensional Array of at least four or more, spatially separated measurement areas (d) on this platform, characterized in that the excitation light is directed from at least one excitation light source onto a lattice structure (c) with said measurement areas located thereon and the degree of fulfillment of the resonance condition for the light coupling into the layer (a) to said measuring areas from the signal from at least one spatially resolving detector for detecting the transmitted excitation light on the opposite side of the grating waveguide structure with respect to the incident excitation light and / or for detecting the substantially parallel to the reflected light again decoupled light on the same side of the grating-waveguide structure with respect to the irradiated excitation light
  • a method for the qualitative and / or quantitative detection of one or more analytes in one or more samples on at least two or more, spatially separated measurement areas on a grating-waveguide structure is preferred by determining changes in the resonance conditions Coupling an excitation light into a waveguide or coupling out a light guided in the waveguide, with an array of at least two or more, spatially separated measurement areas (d) on this platform, characterized in that the excitation light from at least one excitation light source on a grating structure (c) said measuring areas located thereon are guided and the degree of fulfillment of the resonance condition for the light coupling into the layer (a) to said measuring areas from the signal from at least one spatially resolving detector for detecting the transmitted excitation ngslichts, optionally using a diffusely reflective and / or diffusely transmissive projection wall on the opposite side of the grating-waveguide structure with respect to the irradiated excitation light, for generating an image of the transmitted excitation light,
  • the excitation light is radiated essentially in parallel and is essentially monochromatic. It is particularly advantageous if the excitation light is irradiated in a linearly polarized manner to excite a TE 0 or TM 0 mode carried in layer (a).
  • a further preferred embodiment of the method according to the invention is that the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into the layer (a) in the area of the measurement areas by sequential detection of the transmitted excitation light on the opposite side of the grating with respect to the irradiated excitation light - Waveguide structure and / or by sequential detection of the light coupled out again essentially parallel to the reflected light on the same side of the grating waveguide structure with respect to the incident excitation light and / or by sequential detection of the scattered light from after coupling in via a grating structure (c) in the layer (a) guided excitation light, each with one or more spatially resolving detectors while changing the angle of incidence of the excitation light onto the grating waveguide structure.
  • a preferred embodiment of the method according to the invention is characterized in that the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into the layer (a) or coupling out a light guided in the waveguide in the area of the measuring ranges by sequential detection of the transmitted excitation light and / or by sequential Detection of the light coupled out again essentially parallel to the reflected light on the same side of the grating-waveguide structure with respect to the incident excitation light and / or by sequential detection of the scattered light from after coupling in via a grating structure (c) in the layer (a) guided excitation light, each with one or more spatially resolving detectors with changing the angle of incidence of the excitation light on the grating waveguide structure.
  • an image of the transmitted excitation light is generated on a diffusely reflecting and / or diffusely transmissive projection wall on the opposite side of the grating-waveguide structure with respect to the irradiated excitation light and that image is recorded with at least one spatially resolving detector.
  • a particularly preferred embodiment of this method is characterized in that the angle of incidence of the excitation light onto the grating-waveguide structure is set such that the resonance condition for coupling an excitation light into a waveguide of a grating-waveguide structure or coupling out a light guided in the waveguide, with an array of at least two or more, spatially separated measuring areas (d) on this grating waveguide structure, on one or more of these measuring areas is essentially fulfilled, with the result of an essentially maximum signal from a spatially resolving detector for detecting the essentially parallel to the reflected light, light decoupled again on the same side of the grating-waveguide structure with respect to the incident excitation light and / or for detecting the scattered light of excitation light guided in layer (a) after coupling via a grating structure (c), from the range of these measuring ranges, and / or an essentially minimal signal of a spatially resolving detector for detecting the transmitted excitation light in the region of the measuring ranges or between the measuring ranges,
  • the differences to meet the resonance conditions on the area of the grating-waveguide structure irradiated with excitation light are less than half the width of the resonance curve of the coupling angle, under the respective conditions, a clear correlation between this intensity and the degree of fulfillment of the resonance condition can be derived from the intensity of the respective measurement light, so that a sequential recording of the resonance curves, for example by changing the angle of incidence on the Lattice waveguide structure or by changing the incident wavelength, is not required, but the information about the local degree of compliance with the resonance conditions and thus about the local effective refractive index can be obtained with a single image acquisition.
  • local differences in the effective refractive index in the range of different measurement ranges and in the ranges between the measurement ranges from local differences in the intensities of one or more spatially resolving detectors, for detecting the transmitted excitation light and / or for detecting the substantially parallel to the reflected light decoupled light on the same side of the grating-waveguide structure with respect to the irradiated excitation light and / or for detecting the scattered light of excitation light guided after coupling via a grating structure (c) in the layer (a) without the set incidence angle being determined of the excitation light on the grating-waveguide structure is changed.
  • Another preferred embodiment of the method according to the invention is characterized in that the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into layer (a) or coupling out a light guided in the waveguide from at least one light source which can be tuned over a certain spectral range in the range of the measuring ranges sequential detection of the transmitted excitation light and / or by sequential detection of the light coupled out again essentially parallel to the reflected light on the same side of the grating waveguide structure with respect to the irradiated excitation light and / or by sequential detection of the scattered light from after coupling via a Lattice structure (c) in the layer (a) guided excitation light, each with one or more spatially resolving detectors while changing the emission wavelength of said at least one tunable lic Source, preferably at a constant angle of incidence of this excitation light onto the grating waveguide structure.
  • the change in the emission wavelength of a tunable light source to determine local differences in the resonance condition instead of a change in the angle of incidence has the named advantage of avoiding mechanically movable components.
  • This method can also offer the considerable advantage of a possible higher resolution at lower system costs: With typical commercial laser diodes, for example, the emitted laser wavelength can be controlled very precisely via the supplied operating current. The generation of an extremely precisely determinable excitation wavelength can thus be considerably more cost-effective than a high-resolution angle setting and angle determination using optomechanical components.
  • said at least one tunable light source can be tuned over a spectral range of at least 1 nm.
  • said at least one tunable light source can be tuned over a spectral range of at least 5 nm.
  • Said at least one tunable light source can be, for example, a laser diode.
  • a further preferred embodiment of the method is characterized in that an image of the transmitted excitation light is generated on a diffusely reflecting and / or diffusely transmissive projection wall on the opposite side of the grating waveguide structure with respect to the irradiated excitation light, and this image with at least one spatially resolving detector is detected.
  • a further preferred embodiment of the method consists in that the emission wavelength of at least one tunable light source, preferably at a constant angle of incidence of this excitation light onto the grating-waveguide structure, is set such that the resonance condition for coupling an excitation light into a waveguide of a grating-waveguide structure Structure or coupling out of a light guided in the waveguide, with an array of at least two or more, spatially separated measuring areas (d) on this grating waveguide structure, on one or more of these measuring ranges is essentially fulfilled, with the result of an essentially maximum signal from a spatially resolving detector for detecting the light which is essentially coupled out again parallel to the reflected light on the same side of the grating-waveguide structure with respect to the irradiated excitation light and / or for detecting the scattered light of excitation light guided in the layer (a) after coupling in via a grating structure (c), from the area of these measurement areas, and / or an essentially minimal signal from a spatially re
  • the differences to meet the resonance conditions on the area of the grating-waveguide structure irradiated with excitation light are less than half the width of the resonance curve of the coupling wavelength (instead of the coupling angle for the case of constant irradiation angle but variable excitation wavelength) under the respective conditions , a clear correlation between this intensity and the degree to which the resonance condition is fulfilled can in turn be derived from the intensity of the respective measurement light, so that a sequential recording of the resonance curves, for example by changing the irradiated wavelength, is not necessary, but rather the information about the local degree of fulfillment of the resonance conditions and thus can be obtained with a single image acquisition via the local effective refractive index.
  • local differences in the effective refractive index in the range of different measurement ranges and in the ranges between the measurement ranges from local differences in the intensities of one or more spatially resolving detectors, for detecting the transmitted excitation light and / or for detecting the substantially parallel to reflected light again coupled out on the same side of the grating-waveguide structure with respect to the irradiated excitation light and / or for detecting the scattered light of excitation light guided in layer (a) after coupling in via a grating structure (without) the emission wavelength of the tunable light source is changed.
  • the excitation light is irradiated essentially in parallel and is essentially monochromatic.
  • the excitation light is irradiated in a linearly polarized manner to excite one of the TE 0 or TM 0 modes guided in the layer (a).
  • Another embodiment of the method according to the invention is characterized in that the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into the layer (a) or coupling out a light guided in the waveguide from at least one polychromatic light source in a certain spectral range in the range of the measuring ranges by detection of the transmitted excitation light and / or by detecting the light coupled out again essentially parallel to the reflected light on the same side of the grating-waveguide structure with respect to the irradiated excitation light and / or by detecting the scattered light from after coupling in via a grating structure (c) Excitation light guided in layer (a), each with one or more spatially resolving detectors, preferably at a constant angle of incidence of this excitation light onto the grating-waveguide structure, with each being in d In areas in which the resonance condition for coupling this excitation light into a waveguide of the grating-waveguide structure or coupling out a light of this wavelength guided in the waveguide is fulfilled for a
  • Such an embodiment of the method according to the invention with a polychromatic light source is preferred, which is characterized in that a spectrally selective optical component with high spectral resolution in said certain spectral range is arranged in the beam path between the grating waveguide structure and the at least one spatially resolving detector , It is advantageous if said spectrally selective component is suitable for generating spectrally selective, spatially resolved, two-dimensional representations of the intensity distributions of the measurement light emanating from the grating waveguide structure at different wavelengths within said certain spectral range.
  • the excitation light is radiated essentially in parallel. It is particularly preferred for a large number of embodiments of the method according to the invention that the excitation light from at least one light source with an expansion lens is expanded as homogeneously as possible to form an essentially parallel beam and is irradiated onto the one or more measurement areas. It is preferred that the diameter of the irradiated excitation light bundle is at least in one dimension at least 2 mm, preferably at least 10 mm.
  • Another embodiment of the method according to the invention is characterized in that the excitation light from the at least one light source through one or, in the case of several light sources, optionally several diffractive optical elements, preferably Dammann grids, or refractive optical elements, preferably microlens arrays, into one
  • diffractive optical elements preferably Dammann grids, or refractive optical elements, preferably microlens arrays
  • a further embodiment of the method according to the invention for the qualitative and / or quantitative detection of one or more analytes in one or more samples on at least two or more, spatially separated measurement areas on a grating waveguide structure according to the invention according to one of the aforementioned embodiments in an optical system according to the invention By determining changes in the resonance conditions for coupling an excitation light into a waveguide or coupling out a light guided in the waveguide, with an array of at least two or more spatially separated measuring areas (d) on this grating waveguide structure, it is characterized in that the Excitation light from at least one, preferably monochromatic, light source with beam shaping optics to form a beam of rays that is as homogeneous as possible and has a columnar cross section (in a plane perpendicular to the optical axis of the beam path) ) is expanded, the main axis of which is aligned parallel to the grating lines, the partial beams of said beam bundle in a projection plane parallel to the plane of the grating
  • said convergence or divergence angle of said radiation beam has a value of up to 1 ° in a plane orthogonal to the plane of the grating waveguide structure.
  • Such a method according to the invention is characterized in that the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into the layer (a) or coupling out a light guided in the waveguide, in the area of the measurement areas, within a slit-shaped illuminated area according to the above embodiment by simultaneous detection of the transmitted excitation light and / or by simultaneous detection of the light coupled out again essentially parallel to the reflected light on the same side of the grating-waveguide structure with respect to the incident excitation light and / or by simultaneous detection of the scattered light from after coupling in via a grating structure ( c) excitation light carried in layer (a), each with one or more spatially resolving detectors, the local change in the resonance conditions in a measuring range being a shift in the maximum s the light emanating from said measuring area essentially parallel to the reflected light and the maximum of the scattered light emanating from the measuring area after coupling in via a grating structure (c) in the excitation light guided in the layer (a) and the minimum
  • This method is also characterized in that the extent of the changes in said resonance conditions and thus the changes in the effective refractive index in the area of said measuring range can be determined from the magnitude of said shift of the minimum or maximum.
  • This method according to the invention also comprises an embodiment, which is characterized in that the spatially resolved determination of changes in said resonance conditions in each case simultaneously in the area of the measurement areas within a slit-shaped, or converges within a certain angular range with a plane orthogonal to the plane of the grating waveguide structure divergent bundles of rays, according to one of the above-mentioned embodiments of this method, illuminated area, by simultaneous detection of the transmitted excitation light and / or by simultaneous detection of the light coupled out again essentially parallel to the reflected light on the same side of the grating waveguide with respect to the irradiated excitation light - Structure and / or by simultaneous detection of the scattered light of excitation light guided in the layer (a) after coupling via a grating structure (c) with one or
  • the inventive method according to the aforementioned embodiments is characterized in that the spatial resolution for determining the degree of fulfillment of the The resonance condition for the light coupling into the layer (a) can be improved by choosing a greater modulation depth of lattice structures (c) or the choice of a smaller modulation depth of said lattice structures can be reduced.
  • the method according to the invention is characterized in that the full width at half maximum of the resonance angle to meet the resonance condition for the light coupling into the layer (a) can be reduced by reducing the modulation depth of lattice structures (c), which increases the sensitivity in the spatially resolved determination of changes in the Degree of compliance with the resonance condition as a result of local changes in the mass occupancy, or more generally the local effective refractive index, or can be increased by increasing the modulation depth of said lattice structures, which results in a reduced sensitivity in the spatially resolved determination of changes in the degree of compliance with the Resonance condition as a result of local changes in mass occupancy, or more generally the local effective refractive index.
  • the resonance angle for excitation of a TM 0 mode is defined more sharply by a factor of 5 to 10, ie the corresponding half-value width is smaller by this factor than that half-value width for excitation of a TEo mode.
  • a preferred embodiment of the method according to the invention is characterized in that the degree of fulfillment of the resonance condition for the coupling of light into the layer (a) to the measurement areas from the intensity of the excitation light, which is essentially coupled out parallel to the reflected light, (i.e. from the sum of both) Shares) is determined.
  • Another preferred embodiment of the method is characterized in that the degree of fulfillment of the resonance condition for the light coupling into the layer (a) to the measurement areas is determined from the intensity of the transmitted excitation light.
  • the first-mentioned embodiment is characterized in that the local fulfillment of the resonance condition for the light coupling into the layer (a) to a measuring range is determined from a maximum of the sum of the intensities of the reflected and of the excitation light which is essentially coupled out again in parallel from this measuring range.
  • the embodiment of the method according to the invention mentioned below is characterized in that the local fulfillment of the resonance condition for the light coupling into the layer (a) to a measuring range is determined from a minimum of the intensity of the transmitted excitation light in this measuring range. In ideal cases, the intensity of the transmitted excitation light can drop almost to zero.
  • two or more coherent light sources with the same or different emission wavelength are used as excitation light sources.
  • a major advantage of the method according to the invention is that the use of any labels (labeling molecules to be bound to the analyte or its analogs or its binding partners) is in principle not necessary.
  • a further development of the method can be advantageous, which is characterized in that, in order to increase the change in the mass occupancy during binding or dissociation, analyte molecules to be detected are bound to this or to one of its binding partners in a multi-stage assay, for example a mass label can be selected from the group of metal colloids (eg gold colloids), plastic particles or beads or other microparticles with a monodisperse size distribution.
  • a component of the method according to the invention is also an embodiment, which is characterized in that, in order to increase the change in the effective refractive index during the binding or dissociation of analyte molecules to be detected, an “absorption label” is bound to this or to one of its binding partners in a multi-stage assay, said “ Absorption label "has an absorption band of a suitable wavelength, which absorption, as an imaginary part of the refractive index, leads to a change in the effective refractive index in the near field of the grating waveguide structure.
  • the mathematical-physical methods for converting the effect of an absorption at a certain wavelength on the refractive index as a function of the wavelength are known from the literature.
  • a further development of the method according to the invention is characterized in that, in addition to the spatially resolved determination of changes in the resonance conditions for coupling an excitation light into layer (a) of a grating waveguide structure according to the invention or coupling out a light guided in layer (a), one or a plurality of luminescences excited in the evanescent field of an excitation light guided in the layer (a) are determined from one or more measuring ranges.
  • said receptor-ligand system can be a transmembrane receptor protein to which a corresponding ligand from a sample supplied binds.
  • a functional response of this receptor-ligand system can consist, for example, in the opening of an ion channel, with the result of a local change in the pH and / or the ion concentration.
  • a local change can for example using a luminescent dye with pH-dependent and / or ion-dependent luminescence intensity and / or spectral emission.
  • This combined measurement method also enables, for example, the density of the immobilized biological or biochemical or synthetic recognition elements as receptors in one or more measurement ranges based on the differences between the resonance conditions for coupling an excitation light into layer (a) of the grating waveguide structure or coupling out one light carried in layer (a), in the area of these measurement areas, and the corresponding resonance conditions in their environment, ie outside of said measuring ranges, and to determine the binding of a ligand as analyte to these recognition elements on the basis of a change in luminescence from said measuring ranges.
  • a luminescence or fluorescence label can be used to generate the luminescence or fluorescence, which can be excited and emitted at a wavelength between 300 nm and 1100 nm.
  • the luminescent or fluorescent labels can be conventional luminescent or fluorescent dyes or so-called luminescent or fluorescent nanoparticles based on semiconductors (WCW Chan and S. Nie, "Quantum dot bioconjugates for ultrasensitive nonisotopic detection", Science 281 (1998) 2016 - 2018) act.
  • the mass label and / or the luminescence label can be bound to the analyte or in a competitive assay to an analog of the analyte or in a multistage assay to one of the binding partners of the immobilized biological or biochemical or synthetic recognition elements or to the biological or biochemical or synthetic recognition elements.
  • the method allows the possibility that the one or more luminescences are measured with a different polarization than that of the excitation light.
  • the method according to one of the preceding embodiments enables simultaneous or sequential, quantitative or qualitative determination of one or more analytes from the group of antibodies or antigens, receptors or ligands, chelators or "histidine tag components", oligonucleotides, DNA or RNA - Strands, DNA or RNA analogs, enzymes, enzyme cofactors or inhibitors, lectins and carbohydrates.
  • the samples to be examined can be naturally occurring body fluids such as blood, serum, plasma, lymph or urine or egg yolk.
  • a sample to be examined can also be an optically cloudy liquid, surface water, a soil or plant extract, a bio- or synthesis process broth.
  • the samples to be examined can also be taken from biological tissue parts.
  • the present invention furthermore relates to the use of a grating waveguide structure according to the invention and / or an optical system according to the invention and / or an analytical system and / or a method according to the invention according to one of the preceding embodiments for determining chemical, biochemical or biological analytes in screening methods in pharmaceutical research, combinatorial chemistry, clinical and preclinical development, for real-time binding studies and for determining kinetic parameters in affinity screenmg and in research, for qualitative and quantitative analyte determinations, in particular for DNA and RNA analysis, for the preparation of toxicity studies and for the determination of expression profiles and for the detection of antibodies, antigens, pathogens or bacteria in pharmaceutical product development and research, human and veterinary diagnostics, the Agrochemical product development and research, the symptomatic and presymptomatic plant diagnostics, for patient stratification in pharmaceutical product development and for therapeutic drug selection, for the detection of pathogens, pollutants and pathogens, in particular salmonella, prions and bacteria, in food and environmental analysis.
  • Example 1 a) Grid-waveguide structure
  • a grating-waveguide structure with the outer dimensions 16 mm wide x 48 mm long x 0.7 mm thick was used.
  • a continuous structure of a surface reef grid with a period of 360 nm and a depth of 25 +/- 5 nm was produced in the substrate by means of holographic exposure of layer (b) and subsequent etching, with the grid lines being oriented parallel to the reported width of the sensor platform.
  • the wave-guiding, optically transparent layer (a) on the optically transparent layer (b) made of Ta 2 O 5 was produced by reactive, magnetic field-assisted DC sputtering (see DE 4410258) and had a refractive index of 2.15 at 633 nm (layer thickness 150 nm ). Under coupling conditions, excitation light of 633 nm can be coupled (and decoupled) into layer (a) at an angle of approximately + 3 ° to the normal of the structure.
  • the grating-waveguide structure was cleaned and epoxysilane in the liquid phase (10 ml (2% v / v) 3-glycidyloxypropyltrimethoxysilane and 1 ml (0.2% v / v) N- Ethyldiisopropylamine silanized in 500 ml ortho-xylene (7 hours at 70 ° C.) Then solutions of 18-mer oligonucleotides (5'-CCGTAACCTCATGATATT-3'-NH2) (18 * - were used with a commercial spotter (Genetic Microsystems 417 Arrayer).
  • a HeNe laser with 1.1 mW output power was used as the excitation light source (Melles-Griot, 05-LHP-901).
  • the polarization of the laser was parallel to the grating lines of the grating Waveguide structure aligned to excite the TEo mode under coupling conditions.
  • the laser beam was expanded seven times with a beam expansion and passed through an aperture of 5 mm in diameter in order to discriminate outer, weaker portions of the expanded laser beam and external diffraction phenomena.
  • the laser light was then strongly attenuated with a neutral filter (ND 4.7) in order to avoid saturation of the detector when measuring the transmitted light component.
  • the laser light was on the side of the optically transparent layer (b) (substrate side made of AF45 glass), where the power after attenuation is about 20 nW.
  • the grating-waveguide structure was mounted in a plane essentially perpendicular to the optical axis of the excitation light on a manually adjustable goniometer, with which the angle of incidence of the excitation light with respect to the sensor platform could be changed, the grating lines being perpendicular to the projection of the excitation light into the plane the grating waveguide structure.
  • a CCD camera (Ultra Pix 0401E, Astrocam, Cambridge, UK) with Peltier cooling and a Kodak CAF chip KAF 0401 E-l was used as the spatially resolving detector.
  • the camera was aligned after the excitation light had passed through the optically transparent, waveguiding layer (a) in such a way that the transmission light fell essentially perpendicularly onto the entrance lens of the camera.
  • the measurement procedure was carried out in air, ie without additional sample containers or added reagents.
  • the fulfillment of the resonance condition in the areas of the grating waveguide structure that are free of measurement areas can be determined from the almost complete disappearance of the transmission light (FIG. 1 a), the non-fulfillment of the resonance condition in the measurement areas being surprisingly clear under the same conditions shows increased transmission signal (Fig. 1 a and Fig. lb with a linear section through the signals through two measuring ranges).
  • the strong contrast and the high spatial resolution are very surprising, as is the observation from FIG. 1b that (an inhomogeneous mass occupancy to be expected according to the deposition method) within a measuring range, with a maximum approximately in the center) can also be resolved with this measuring method.
  • the extraordinarily high sensitivity which enables the differences in mass coverage (between the areas of the spots and the surrounding areas) of lpg / m ⁇ T, with an excellent contrast.
  • Example 2 a) Grating waveguide structure
  • a grating waveguide structure with the outer dimensions of 16 mm wide x 48 mm long x 0.7 mm thick was used.
  • the then waveguiding, optically transparent layer (a) on the optically transparent layer (b) made of Ta 2 O 5 had a refractive index of 2,137 at 532 nm (layer thickness 150 nm).
  • excitation light of 532 nm can be coupled into (and out of) the structure at an angle of approximately + 14.3 ° to the normal of the structure.
  • the grating-waveguide structure was cleaned in preparation for the immobilization of the biochemical or biological or synthetic recognition elements. Thereafter, using a commercial spotter (GeSim), NeutrAvidin TM solutions were applied in an array of 3 x 3 spots (3 rows x 3 columns) to the cleaned tantalum pentoxide surface (500 pl per spot). The concentration of the applied solutions was 1.7 x 10 "5 M NeutrAvidin TM, so that the spots generated (approx. 430 ⁇ m diameter in a centram-to-centram distance of 1 mm) as measuring areas with a mass coverage of approximately 4 ng / mm 2nd
  • a diode-pumped, frequency-doubled NdYag laser with 10 mW output power was used as the excitation light source (Laser 2000).
  • the polarization of the laser was perpendicular to the grating lines of the grating-waveguide structure, to excite the TMo mode under coupling conditions.
  • the laser beam was expanded seven times with a beam widening and passed through a gap of 4 mm in width in order to discriminate external, weaker portions of the expanded laser beam and external diffraction phenomena.
  • the laser light was on the side of the optically transparent layer (b) (substrate side made of AF45 glass).
  • the grating-waveguide structure was mounted on a manually adjustable goniometer, with which the angle of incidence of the excitation light with respect to the sensor platform could be changed so that the grating lines were perpendicular to the projection of the excitation light into the plane of the grating-waveguide structure.
  • a sheet of ultra-fine white paper with low grain size was mounted as a diffusely reflecting projection wall on the opposite side of the grating waveguide structure with respect to the irradiated excitation light, in order to produce an image of the transmitted excitation light. Since the transmitted excitation light had a practically perfectly parallel beam path, the distance to the grating-waveguide structure, which was essentially parallel to it, was freely selectable over a large area, i.e.
  • a CCD camera (Ultra Pix 0401E, Astrocam, Cambridge, UK) with Peltier cooling and a Kodak KAF 0401 El CCD chip was used as the spatially resolving detector.
  • the camera was used for the spatially resolved determination of the transmitted excitation light, by means of capturing its image on the above-mentioned projection screen, and / or for capturing the scattered light from excitation light guided in layer (a) after coupling via a grating structure (c) and / or for capturing the mounted essentially parallel to the reflected light again on the same side of the grating waveguide structure with respect to the incident excitation light.
  • the measurement procedure was carried out in air, i.e. without additional sample containers or added reagents.
  • a difference in coupling angle of 0.124 ° was found between coupling on the measuring areas and coupling on the uncoated areas of the grating-waveguide structure.
  • FIG. 3 shows the results of the measurement method for the spatially resolved determination of the transmitted excitation light, by capturing its image on the above-mentioned projection wall and positioning the camera on the same side of the grating-waveguide structure with respect to the irradiated excitation light.
  • 3C shows the reverse situation, that is to say the fulfillment of the resonance condition for coupling light into the layer (a) in the area of the measurement areas (at an angle of 14,424 °, see FIG. 3 on the left), with the result of minimal transmission at this angle in the measurement areas , and failure to meet the resonance condition in the other areas with which Under maximum transmission.
  • FIG. 3C it can be seen, based on concentrically occurring, dotted, circle-like lines within the dark measuring areas near their outer edges, lighter areas that are recognizable that even under these conditions (with excitation of transversely magnetically polarized guided modes) there is a spatial resolution well below the spot diameter is:
  • the different brightness areas within the spots show geometric inhomogeneities in the amounts of locally adsorbed or immobilized proteins or recognition elements.
  • Example 3 Uniformity of the resonance angle for coupling or extracting light on a surface corresponding to an array of measuring ranges
  • a grating-waveguide structure (with a full-area modulated grating) with the same predetermined layer and grating parameters as in example a) is used.
  • the variability of the coupling angle in the x and y directions (x: perpendicular to the grid lines, y: on a square area of 5 mm x 5 mm, corresponding to a typical base area for an array of measurement areas which may be to be produced on such a structure parallel to the grid lines).
  • the parallel excitation light beam of a He-Ne laser (633 nm, 0.8 mm beam diameter) is directed onto the structure at an angle close to the resonance angle for coupling light into the layer (a). In an angular range of approximately 1 ° above and below the resonance angle, the angle of incidence is varied in small steps (step size, for example 0.02 °).
  • step size for example 0.02 °.
  • the intensity of the scattered light of the light guided in the layer (a) after coupling in via the grating structure is collected with a lens system and focused on a photomultiplier, as an integral, non-spatially resolving detector.
  • the size of the surface of the grating-waveguide structure imaged on the detector can be limited (in this example to a circle with a diameter of 1 mm), in particular to reduce undesired stray light influences.
  • the optimal one Adjustment to meet the resonance condition for the coupling of light into layer (a) can be recognized by a maximum value of L.
  • the half-width of the associated resonance curves can also be determined from the resonance curves of L as a function of the coupling angle.
  • the measurement method described above was carried out for 25 (5 x 5) measurement positions on the surface of the grating-waveguide structure, at a respective (centram-to-centram) distance of 1 mm.
  • the resonance angles of the various measurement positions in the x / y grid mentioned are summarized in Table 1.
  • the deviation from the mean value (in this example 2.15 °) is not more than 0.06 ° over the entire surface.
  • Table 1 Variability of the resonance angle for optimal light coupling in and coupling out over a square area of 5 mm x 5 mm of a grating waveguide structure according to the invention (before generating the measuring areas located thereon).

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Abstract

L'invention concerne des modes de réalisation variables de structure réticulaire de guide d'ondes, permettant de déterminer des modifications à résolution locale de conditions de résonance, pour injecter une lumière d'excitation dans la couche de guidage d'ondes (a) d'un guide d'ondes feuilleté optique, par l'intermédiaire d'une structure réticulaire (c) modulée dans la couche (a) ou faire sortir une lumière guidée dans la couche (a). Cette structure comporte des rangées de zones de mesure présentant chacune différents éléments d'identification biologiques, biochimiques ou synthétiques immobilisés, pour fixer et déterminer simultanément un ou plusieurs analytes. La lumière d'excitation est injectée par rayonnement simultanément sur une rangée complète de zones de mesure et le degré de satisfaction de la condition de résonance requise pour injecter de la lumière dans la couche (a) est mesuré simultanément dans les zones de mesure indiquées. L'invention concerne également un système optique avec au moins une source lumineuse d'excitation et au moins un détecteur à résolution locale, ainsi qu'éventuellement des éléments de positionnement pour modifier l'angle d'incidence de la lumière d'excitation sur la structure réticulaire de guide d'ondes selon l'invention. L'invention concerne également un procédé de mesure approprié et son utilisation. Etonnamment, il a été démontré que le procédé selon l'invention s'utilise comme procédé d'identification générateur d'images, à haute résolution locale et à sensibilité élevée.
EP01901178A 2000-05-06 2001-01-19 Structure reticulaire de guide d'ondes pour determiner des multi-analytes et son utilisation Withdrawn EP1281063A1 (fr)

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US20090054263A1 (en) 2009-02-26
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JP2003533692A (ja) 2003-11-11
AU2001226796A1 (en) 2001-11-26

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