EP1272829A1 - Structure reseau de guide d'onde destine a intensifier un champ d'excitation et son utilisation - Google Patents

Structure reseau de guide d'onde destine a intensifier un champ d'excitation et son utilisation

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Publication number
EP1272829A1
EP1272829A1 EP01936198A EP01936198A EP1272829A1 EP 1272829 A1 EP1272829 A1 EP 1272829A1 EP 01936198 A EP01936198 A EP 01936198A EP 01936198 A EP01936198 A EP 01936198A EP 1272829 A1 EP1272829 A1 EP 1272829A1
Authority
EP
European Patent Office
Prior art keywords
layer
grating
excitation light
waveguide structure
intensity
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.)
Withdrawn
Application number
EP01936198A
Other languages
German (de)
English (en)
Inventor
Gert Duveneck
Martin Bopp
Michael Pawlak
Markus Ehrat
Gerd Marowsky
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zeptosens AG filed Critical Zeptosens AG
Publication of EP1272829A1 publication Critical patent/EP1272829A1/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Withdrawn legal-status Critical Current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
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/645—Specially adapted constructive features of fluorimeters
    • G01N21/648—Specially adapted constructive features of fluorimeters using evanescent coupling or surface plasmon coupling for the excitation of fluorescence
    • 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
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/124—Geodesic lenses or integrated gratings
    • 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
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N2021/6417—Spectrofluorimetric devices
    • G01N2021/6419—Excitation at two or more wavelengths
    • 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
    • G01N2021/7769—Measurement method of reaction-produced change in sensor
    • G01N2021/7786—Fluorescence

Definitions

  • the invention relates to a variable embodiment of a grating waveguide structure based on a planar thin-film waveguide with a first optically transparent layer (a) on a second optically transparent layer (b) with a lower refractive index than layer (a) and one in the optically transparent Layer (a) modulated lattice structure (c), characterized in that the intensity of an excitation light irradiated at the resonance angle for coupling into the layer (a) on the layer (a) and in the layer (a) at least in the region of the lattice structure (c ) is amplified by at least a factor of 100 compared to the intensity of this excitation light on a substrate surface without coupling the excitation light.
  • the invention also relates to an optical system with an excitation light source and a design according to the invention of a grating waveguide structure, and to a method for amplifying an excitation light intensity and its use in bioanalytical detection methods, in non-linear optics or in telecommunications or communications technology.
  • the aim of the present invention is to provide optical structures and optical methods which can be carried out in a simple manner, in order to to achieve a very high amplification of an excitation light field on this structure or at a distance of less than approximately 200 nm.
  • gratings as diffractive components in optics has been described in a large number of papers and has been implemented in technical components based on them.
  • the well-known grating monochromators as a component of spectrometers, are based on the wavelength-dependent deflection of an incident polychromatic light beam in different spatial directions.
  • Lattice structures have found increasing use in modern optics since the techniques for producing high-precision gratings, in particular also with a very short period, for example of significantly less than 400 nm, have been improved ever more.
  • Examples of application areas are integrated optics, quantum electronics, telecommunications with optical communication, for example for optical switches or distributors, etc.
  • 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”.
  • optical transparency of a material is used in the following in the sense that the transparency of this material is required at at least one excitation wavelength. With a longer or shorter wavelength, this material can also be absorbent.
  • WO 95/33197 describes a method in which the excitation light is coupled into the waveguiding film as a diffractive optical element via a relief grating.
  • the surface of the sensor platform is brought into contact with a sample containing the analyte, and the isotropically emitted luminescence in the penetration depth of the evanescent field of luminescent substances is measured by means of suitable measuring devices, such as photodiodes, photomultipliers or CCD cameras. It is also possible to decouple and measure the portion of the evanescently excited radiation fed back into the waveguide via a diffractive optical element, for example a grating. This method is described for example in WO 95/33198.
  • a disadvantage of all of the methods described above in the prior art, in particular in WO 95/33197 and WO 95/33198, for detecting evanescently excited luminescence is that only one sample can be analyzed in each case on the wave-guiding layer of the sensor platform which is formed as a homogeneous film. In order to be able to carry out further measurements on the same sensor platform, complex washing or Cleaning steps necessary. This applies in particular if an analyte different from the first measurement is to be detected. In the case of an immunoassay, this generally means that the entire immobilized layer on the sensor platform must be replaced or a new sensor platform must be used as a whole.
  • Arrays with a very high feature density are known based on simple glass or microscope plates, without additional waveguiding layers.
  • US 5445934 (Affymax Technologies) describes and claims arrays of oligonucleotides with a density of more than 1000 features per square centimeter.
  • the excitation and reading of such arrays is based on classic optical arrangements and methods.
  • the entire array can be illuminated simultaneously with an expanded excitation light bundle, which, however, leads to a relatively low sensitivity, since the excitation is not limited to the interacting surface and because the scattered light component is also relatively large and scattered light or background fluorescent light from the glass substrate also in the Areas are generated in which there are no immobilized oligonucleotides for binding the analyte.
  • a co-pending application (PCT / EP 00/04869) describes a sensor platform with a layer waveguide, comprising an optically transparent layer (a) on a second layer (b) with a lower refractive index than layer (a) and one in the optically transparent one Layer (a) modulated lattice structure (c) with measurement areas generated thereon.
  • the parameters in particular the grating depth, after coupling excitation light to the measurement areas and the associated luminescence excitation in the near field of layer (a), the luminescence light fed back into layer (a) can be used over the shortest distances, i.e. a few hundred micrometers, completely decoupled and thus prevented from spreading further in the waveguiding layer (a).
  • the sensitivity can be further increased by optimizing the beam paths and masking out reflections or scattered light, but ultimately the background signals and the associated background noise remain limiting.
  • the spectral distance between the excitation and emission wavelengths is relatively small, typically between 20 nm and 50 nm.
  • Some luminescent dyes are known which have a large Stokes shift , up to about 300 nm, such as some lanthanide complexes. However, they generally have a relatively low quantum yield and / or photostability.
  • excitation intensity densities in the order of at least 20 MW / cm 2 are required.
  • intensity densities have been achieved and described, for example, with pulsed high-power lasers in confocal microscopic arrangements, as for example in US 5034613 with a laser focus diameter of less than one micrometer in the focus plane of the microscope.
  • pulsed high-power lasers in confocal microscopic arrangements, as for example in US 5034613 with a laser focus diameter of less than one micrometer in the focus plane of the microscope.
  • the measurement of an extensive area by means of scanning in addition to the great expenditure on instruments, also disadvantageously requires a great deal of time.
  • inventive grating waveguide structures are suitable for use in a large number of different technical fields.
  • communication technology for example, is another important area of application.
  • the degree of networking of the systems and the scope of the amount of data to be transmitted optical signal transmission is becoming increasingly important.
  • there is a great need here to also be able to optically switch data transmitted optically Systems currently in use must first convert the optical signals into electrical signals. The electrical signals are then switched electrically and then converted back into optical signals. This requires a high level of technical effort and is at the same time associated with significant losses in the speed of data transmission.
  • a waveguide made of a material with high third-order non-linearity is used.
  • Such a material is characterized by the fact that its refractive index changes in the presence of high electromagnetic field strengths.
  • a grating is structured in the form of a "Bragg gratings" in the waveguide. This is distinguished by the fact that it is for certain Wavelengths of a light guided in the waveguide is reflective and transmissive for others.
  • the waveguides mentioned and the gratings located therein are designed such that, in the unaffected case, a guided optical signal (light pulse) coming from an unstructured area of the waveguide is transmitted from the grating structure, that is to say is passed on through the grating structure in the direction of propagation ,
  • a second pulse of very high intensity known as a “switching pulse”
  • the Bragg grating hits the Bragg grating at the same time as the signal pulse
  • the optical properties of this grating structure change due to the non-linearity of the third order such that the signal pulse is reflected (see, for example, BCM de.
  • the switching pulse is guided in the same waveguide as the signal pulse and must therefore be coupled in and out via an additional device.
  • the switching effect can surprisingly also be achieved due to the strong increase in the field strength can be achieved in the waveguide (a) in the case of resonance at significantly lower intensities of the switching pulse.
  • this new embodiment of an optical switch according to the invention offers the advantage that an additional coupling, guidance in the waveguide and subsequent coupling out of the switching pulse at another location on the structure is eliminated.
  • the first object of the invention is a grating waveguide structure, comprising a planar thin-film waveguide, with a layer (a) transparent at at least one excitation wavelength on a layer (b) with a lower refractive index than layer (a), which is likewise transparent at at least this excitation wavelength. and at least one grating structure (c) modulated in layer (a), characterized in that the intensity of an excitation light irradiated at the resonance angle for coupling into layer (a) on the Layer (a) and in layer (a) at least in the area of the lattice structure (c) is amplified by at least a factor of 100 compared to the intensity of this excitation light on a substrate surface without coupling the excitation light.
  • the most important parameters for the design of the grating waveguide structure in order to achieve the greatest possible amplification effect are the depth of the grating structure (c) and the refractive index of the optical layer (a) and its thickness.
  • This high amplification of an irradiated excitation light intensity by means of a grating waveguide structure according to the invention means that the intensity of the excitation light on the layer (a) is sufficiently high to be on the surface of the layer (a) or at a distance of less than 200 to excite molecule to layer (a) by means of 2-photon absorption for luminescence.
  • the structure according to the invention makes it possible to cover the required intensity densities over a large area, that is to say on to achieve an area in the order of several square millimeters to square centimeters.
  • a grating-waveguide structure is therefore preferred, which is characterized in that the intensity of the excitation light on the layer (a) is simultaneously sufficiently high on an area of at least 1 mm 2 on said grating-waveguide structure to be to excite molecules on the surface of layer (a) or at a distance of less than 200 nm from layer (a) by means of 2-photon absorption for luminescence.
  • the very high excitation intensity in particular to enable 2-photon excitation, is useful for a large number of different applications, for example in Biosensors, as explained in more detail later, but also in communications and (tele) communication technology for fast signal transmission.
  • the grating waveguide structure comprises devices for signal transmission to an adjacent grating waveguide structure. This can be achieved in that a luminescence generated on or in the near field of the layer (a) by 2-photon absorption is transmitted to an adjacent grating waveguide structure by means of coupling out via a grating structure (c).
  • the structure comprises uniform, unmodulated regions of the layer (a), which are preferably arranged in the direction of propagation of the excitation light coupled in via a grating structure (c) and guided in the layer (a).
  • the structure can be designed in such a way that it comprises a plurality of lattice structures (c) of the same or different period with optionally adjoining uniform, unmodulated regions of the layer (a) on a common, continuous substrate. This also makes it possible for a luminescence generated on or in the near field of layer (a) to be at least partially coupled into layer (a) and conducted by conduction in layer (a) to adjacent areas on said lattice structure. Waveguide structure is guided.
  • such an embodiment of the grating waveguide structure according to the invention is preferred, which is characterized in that the intensity of the excitation light on layer (a) and in layer (a) is sufficient, at least in the region of the grating structure (c) is high for switching the transmission properties of the lattice structure (c) for a light signal carried in layer (a).
  • the switching effect is based on the fact that the high light intensity and field strength, in this case within layer (a), are sufficient to match the transmission properties of a grating-waveguide structure according to the invention, which in this case is called "Bragg-Grating" with the characteristic features , the aforementioned properties is designed to change.
  • a particular advantage of such a grating waveguide structure according to the invention is that the transmission properties of the grating structure (c) can be switched by means of an excitation light radiated onto said grating structure from outside the layer (a).
  • the switching function of the grating waveguide structure according to the invention is preferably made possible in that said grating structure (c) is designed as a "Bragg grating" and the switching function is based on the change in the grating function from transmission to reflection of a light signal carried in layer (a) a change in the optical refractive index caused by the increased excitation light intensity in the layer (a) in the region of the grating structure.
  • excitation light of different wavelengths For certain applications, it is desirable to use excitation light of different wavelengths simultaneously or sequentially for the same grating waveguide structure. It can then be advantageous if this comprises an overlay of 2 or more grating structures of different periodicity with mutually parallel or non-parallel, preferably non-parallel alignment of the grating lines, which serves to couple excitation light of different wavelengths, in the case of 2 superimposed grating structures Grid lines are preferably aligned perpendicular to each other.
  • 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 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.
  • suitable plastics are polystyrene, polyethylene, polyethylene terephthalate, poplypropylene or polyurethane and their derivatives.
  • 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) is a material from the group of TiO 2 , ZnO, Nb 2 O 5 , Ta O 5 , HfO 2 , or ZrO 2 , particularly preferably made of TiO 2 or Nb 2 O 5 or Ta O 5 , or a material with a high non-linearity of the refractive index of the third order, such as, for example, polydiacetylene, polytoluenesulfonate or polyphenylene vinylene.
  • 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 decreases of the evanescent field 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. It is clear that the discrete mode character of the guided light only refers to the transverse modes.
  • the product of the thickness of layer (a) and its refractive index is advantageously one tenth to a whole, preferably one third to two thirds, of the excitation wavelength of an excitation light to be coupled into layer (a).
  • 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 coupling of 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 coupling-out efficiency also increases at the same time, so that it is used, for example, to excite luminescence in a measuring area (d) arranged on or adjacent to the lattice structure (c) (according to the following definition), depending on the geometry of the measuring ranges and the irradiated excitation light bundle, gives an optimum. Because of these boundary conditions, it is advantageous if 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 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 are applied to the grating waveguide structure to facilitate adjustment in an optical system and / or for connection to sample containers 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.
  • the measurement areas can be arranged on such a grating structure or on a uniform, unmodulated area in the direction of propagation of the guided excitation light following such a grating structure his.
  • Different segments can be separated, in particular optically, by lattice structures (c) or by other subdivisions generated on the lattice waveguide structure, for example absorbent strips of an applied pigment or the partitions of structures for producing sample containers with the lattice waveguide structure as the base area be if crosstalk of luminescent light generated in adjacent segments and fed back into layer (a) is to be prevented.
  • different segments can be delimited from one another by an applied border, which contributes to the fluidic sealing against adjacent areas and / or to a further reduction in optical crosstalk between adjacent segments.
  • 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 extend beyond the penetration depth of the evanescent field protruding 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".
  • the measurement areas 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.
  • a luminescence-capable analyte or a luminescence-labeled analogue of the analyte competing with the analyte for binding to the immobilized recognition elements or another luminescence-labeled binding partner in a multi-stage assay these luminescence-capable molecules are only selectively measured in the measurement areas on the surface of the grating waveguide.
  • Bind structure which are defined by the areas occupied by the immobilized recognition elements.
  • 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 ".
  • components from the group can be applied, which include, for example, nucleic acids (e.g. DNA, RNA, oligonucleotides), nucleic acid analogs (e.g. PNA), antibodies, aptamers, membrane-bound and isolated receptors, their ligands , Antigens for antibodies, "histidine tag components", cavities generated by chemical synthesis for the absorption of molecular imprints, etc. is formed.
  • nucleic acids e.g. DNA, RNA, oligonucleotides
  • nucleic acid analogs e.g. PNA
  • antibodies aptamers
  • membrane-bound and isolated receptors their ligands
  • Antigens for antibodies e.g., "histidine tag components”
  • cavities generated by chemical synthesis for the absorption of molecular imprints, etc. is formed.
  • 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 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.
  • any other compound is also suitable as a recognition element which recognizes and interacts with an analyte to be detected in accordance with the desired selectivity required for the respective application.
  • 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 thereby, 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.
  • albumins in particular bovine serum albumin or Human serum albumin, fragmented natural or synthetic DNA that does not hybridize with the polynucleotides to be analyzed, such as, for example, herring or salmon sperm, or also uncharged but hydrophilic polymers, such as polyethylene glycols or dextrans.
  • the selection of the substances mentioned for reducing unspecific hybridization in polynucleotide hybridization assays is determined by the empirical preference for DNA that is as widely different as possible for the polynucleotides to be analyzed, and about which no interactions with the polynucleotide sequences to be detected are known.
  • Another object of the invention is an optical system for amplifying the intensity of an excitation light, comprising at least one excitation light source and a grating waveguide structure according to the invention, characterized in that the intensity of one at the resonance angle for coupling into the layer (a) to one in the Layer (a) modulated grating structure (c) of the grating-waveguide structure of irradiated excitation light on the layer (a) and in the layer (a) at least in the region of the grating structure (c) is amplified by at least a factor of 100 compared to the intensity thereof Excitation light on a substrate surface without coupling the excitation light.
  • preferred configurations of the optical system according to the invention include those configurations with which the intensity of an excitation light radiated under the resonance angle for coupling into the layer (a) on the layer (a) and in the layer (a) at least in the region of the grating structure (c) is amplified by at least a factor of 1,000 or 10,000 or even 100,000 compared to the intensity of this excitation light on a substrate surface without coupling the excitation light.
  • Preferred embodiments of the optical system are those which are characterized in that the intensity of the excitation light on the layer (a) is sufficiently high to be on the surface of the layer (a) or at a distance of less than 200 n from the layer (a a) located molecule by means of 2-photon absorption for luminescence to stimulate. It is particularly preferred if the intensity of the excitation light on the layer (a) is simultaneously sufficiently high on an area of at least 1 mm on said grating waveguide structure to be on the surface of the layer (a) or at a distance of less to excite molecules as 200 nm to layer (a) by means of 2-photon absorption for luminescence.
  • the optical system according to the invention is designed such that a luminescence generated on or in the near field of layer (a) of the grating waveguide structure by means of 2-photon absorption by means of coupling out via a Grating structure (c) can be transferred to an adjacent grating waveguide structure.
  • the grating-waveguide structure as part of the optical system, comprises uniform, unmodulated regions of the layer (a), which preferably extend in the direction of propagation of that which is coupled in via a grating structure (c) and in the layer (a) guided excitation light are arranged.
  • the grating waveguide structure comprises a plurality of grating structures (c) of the same or different periods with optionally adjoining uniform, unmodulated regions of the layer (a) on a common, continuous substrate.
  • the optical system is designed such that a luminescence generated on or in the near field of layer (a) of the grating waveguide structure by means of 2-photon absorption at least partially couples into layer (a) and by conduction into the layer (a) is guided to adjacent areas on said grating waveguide structure.
  • the intensity of the excitation light on the layer (a) and in the layer (a) of the grating waveguide structure, at least in the region of the grating structure (c), is sufficiently high to switch the transmission properties of the grating structure (c) Part of the optical system for a light signal carried in layer (a).
  • the optical system according to the invention with a grating waveguide structure according to the invention leads to the circuit of the Transmission properties of the lattice structure (c) is possible by means of an excitation light radiated onto said lattice structure from outside the layer (a).
  • the optical system according to the invention is characterized in that said grating structure (c) is designed as a "Bragg grating" and the switching function is based on the change of the grating function from transmission to reflection in light of a light signal carried in layer (a) change in the optical refractive index caused by the increased excitation light intensity in the layer (a) in the region of the grating structure.
  • the optical system according to the invention additionally comprises at least one detector for detecting one or more luminescences from the grating waveguide structure.
  • One of the preferred embodiments is characterized in that the excitation light emitted by the at least one excitation light source is essentially parallel and is irradiated at a resonance angle for coupling into the optically transparent layer (a) onto a grating structure (c) modulated in the layer (a) ,
  • a particularly preferred embodiment is characterized in that the excitation light is expanded by at least one light source with an expansion optic to form an essentially parallel beam and is modulated at the resonance angle for coupling into the optically transparent layer (a) to a large area in the layer (a) Lattice structure (c) is irradiated.
  • 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 split up, each of which is essentially parallel to one another Lattice structures (c) are irradiated at the resonance angle for coupling into the layer (a).
  • a plurality of diffractive optical elements preferably Dammann grids, or refractive optical elements, preferably microlens arrays
  • two or more 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 such embodiments, which are characterized in that 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 optical components from 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 deflection of parts of light bundles , Neutral filters for regulating the transmitted light intensity, optical filters or monochromators for the spectrally selective transmission of parts of light beams or polarization-selective elements for the selection of discrete polarizations directions of the excitation and / or luminescent light are formed. It is possible for the excitation light to be irradiated in pulses with a duration of between 1 fsec and 10 minutes and for the emission light to be measured
  • light signals from the group are measured for referencing, which are from excitation light at the location of the light sources or after their expansion or after their subdivision into partial beams, scattered light at the excitation wavelengths from the range of the one or more spatially separated measuring ranges, and above the grating structure (c) is formed in addition to the measuring areas of coupled light of the excitation wavelength. It is particularly advantageous if the measuring ranges for determining the emission light and the reference signal are identical.
  • 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 for the grating waveguide structure to be moved between steps of sequential excitation and detection.
  • Another component of the invention is an analytical system for luminescence detection of one or more analytes in at least one sample on one or more measurement areas on a grating waveguide structure, comprising an optical layer waveguide
  • the analytical system additionally comprises one or more sample containers which are open to the grating waveguide structure at least in the area of the one or more measuring ranges or the measuring ranges combined into segments, the sample containers preferably each having a volume of 0.1 nl - have 100 ⁇ l.
  • a possible embodiment consists in that the sample containers on the side facing away from the optically transparent layer (a), with the exception of inlet and / or outlet openings for the feed or outlet of the samples and possibly additional reagents, are closed and the feed or the outlet of samples and, if necessary, additional reagents take place in a closed flow system, whereby in the case of 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
  • the invention further relates to a method for amplifying an excitation light intensity, characterized in that the intensity of a grating structure (c) of a grating waveguide according to the invention, which is coupled at a resonance angle into the layer (a) onto a grating structure (c) modulated in the layer (a).
  • Structure of irradiated excitation light on the layer (a) and in the layer (a) at least in the region of the lattice structure (c) is amplified by at least a factor of 100 compared to the intensity of this excitation light on a substrate surface without coupling in the excitation light.
  • the amplification factor can be increased further, in particular by optimizing the physical parameters of the grating waveguide structure. Therefore, preferred variants of the method according to the invention include embodiments with which the intensity of one at the resonance angle for coupling into the layer (a) radiated excitation light on the layer (a) and in the layer (a) at least in the region of the lattice structure (c) is amplified by at least a factor of 1,000 or 10,000 or even 100,000 compared to the intensity of this excitation light on a substrate surface without coupling the excitation light.
  • the intensity of the excitation light on the layer (a) is sufficiently high to detect a molecule on the surface of the layer (a) or at a distance of less than 200 nm from the layer (a) by means of 2-photon absorption to stimulate luminescence. It is particularly preferred if the intensity of the excitation light on the layer (a) is simultaneously sufficiently high on an area of at least 1 mm 2 on said grating waveguide structure to be on the surface of the layer (a) or at a distance of to excite molecules less than 200 nm to layer (a) by means of 2-photon absorption for luminescence.
  • embodiments of the method according to the invention are preferred in which a luminescence generated on or in the near field of layer (a) of the grating waveguide structure by means of 2-photon absorption by means of coupling out via a grating structure (c ) is transferred to an adjacent grating waveguide structure.
  • the grating-waveguide structure as part of the optical system, comprises uniform, unmodulated regions of the layer (a), which preferably extend in the direction of propagation of the coupling-in via a grating structure (c) and in the layer (a) guided excitation light are arranged, in particular it can be advantageous if the grating-waveguide structure comprises a plurality of grating structures (c) of the same or different period with possibly subsequent, unmodulated regions of the layer (a) on a common, continuous substrate.
  • the optical system is designed such that a luminescence generated on or in the near field of layer (a) of the grating waveguide structure is at least partially coupled into layer (a) and through through 2-photon absorption Line in the layer (a) to neighboring areas on said grating waveguide structure is performed.
  • Another component of the invention is a method for luminescence detection of one or more analytes in one or more samples on one or more measurement areas on a grating waveguide structure according to the invention for determining one or more luminescence from a measurement area or from an array of at least two or more, spatially separated measuring ranges (d) or at least two or more spatially separated segments (d '), in which several measuring ranges are combined, on said grating waveguide structure, characterized in that the intensity of one at the resonance angle for coupling into the Layer (a) onto a grating structure (c) of the grating waveguide structure, which is modulated in layer (a), on the layer (a) and in the layer (a) at least in the region of the grating structure (c) by at least one factor 100 is amplified compared to the intensity of this excitation light on a substrate surface without coupling the excitation light.
  • preferred variants of the method according to the invention include designs with which the intensity of an excitation light radiated under the resonance angle for coupling into layer (a) on layer (a) and in layer (a) at least in the region of the grating structure (c) at least a factor of 1,000 or 10,000 or even 100,000 is amplified in comparison to the intensity of this excitation light on a substrate surface without coupling the excitation light.
  • the intensity of the excitation light on layer (a) is sufficiently high to use a 2-photon molecule to position a molecule on the surface of layer (a) or at a distance of less than 200 nm from layer (a). To stimulate absorption to luminescence. It is particularly preferred if the intensity of the excitation light on the layer (a) is simultaneously sufficiently high on an area of at least 1 mm 2 on said grating waveguide structure to be on the surface of the layer (a) or at a distance of to excite molecules less than 200 nm to layer (a) by means of 2-photon absorption for luminescence.
  • such an embodiment of the method according to the invention is preferred, which is characterized in that the intensity of the excitation light on the layer (a) and in the layer (a) at least in the region the lattice structure (c) is sufficiently high to switch the transmission properties of the lattice structure (c) for a light signal carried in the layer (a).
  • a particular advantage of this method is that the transmission properties of the grating structure (c) can be switched by means of an excitation light that is radiated from outside the layer (a) onto said grating structure.
  • Such an embodiment of the method according to the invention is preferred, which is characterized in that said lattice structure (c) is designed as a “Bragg grating” and the switching function is based on the change of the lattice function from transmission to reflection of one carried in layer (a) Light signal based on a change in the optical refractive index caused by the increased excitation light intensity in the layer (a) in the region of the grating structure.
  • a particularly preferred embodiment of this method is characterized in that a first excitation light is coupled as a signal light in the form of a temporal pulse or continuously via a first grating structure (c) into the layer (a) and guided therein until said coupled, guided signal light is applied to the Region of another lattice structure (c ') structured in layer (a) with the same or different lattice period as said first lattice structure (c), via which an excitation light radiated from the outside as switching light in the form of a temporal pulse or continuously into the layer ( a) is coupled in and by this amplification of this switching light by at least a factor of 100 on layer (a) and in layer (a), at least in the region of the lattice structure (c '), compared to the intensity of this excitation light on a substrate surface without coupling the excitation light, the refraction
  • the layer (a) is changed due to a high third-order non-linearity, at least in the area of the grating structure (c
  • luminescence detection it is possible for (1) the isotropically emitted luminescence or (2) luminescence or luminescence of both components (1) and (2) coupled into the optically transparent layer (a) and coupled out via lattice structures (c) can be measured simultaneously.
  • a luminescence or fluorescence label can be used to generate the luminescence or fluorescence, which can be excited at a wavelength between 200 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.
  • said luminescence label is excited by means of 2-photon absorption.
  • said luminescence label is excited to an ultraviolet or blue luminescence by 2-photon absorption of an excitation light in the visible or near infrared.
  • 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.
  • a second or even more luminescence label with the same or different excitation wavelength as the first luminescence label and the same or different emission wavelength can be used. It can be advantageous here if the second or even more luminescence label can be excited at the same wavelength as the first luminescence label, but can emit at other wavelengths.
  • the excitation spectra and emission spectra of the luminescence labels used overlap only slightly or not at all.
  • the one or more luminescences and / or determinations of light signals are carried out polarization-selectively at the excitation wavelength. Furthermore, the method allows the possibility that the one or more luminescences are measured with a different polarization than that of the excitation light.
  • a particular embodiment of the method according to the invention for detecting luminescence of one or more analytes is based on the fact that the autofluorescence (“autofluorescence”) of fluorescent biomolecules, such as, for example, proteins with fluorescent amino acids such as tryptophan, which are located on the surface of layer (a) or at a distance of less than 200 nm from layer (a), which can be excited by 2-photon absorption.
  • autofluorescence of fluorescent biomolecules, such as, for example, proteins with fluorescent amino acids such as tryptophan, which are located on the surface of layer (a) or at a distance of less than 200 nm from layer (a), which can be excited by 2-photon absorption.
  • tryptophan has an absorption maximum at 280 nm.
  • excitation of tryptophan fluorescence in a classic single Photon absorption process in the evanescent field of a highly refractive waveguide is not possible, since excitation light of such a short wavelength is not guided over significant distances in the waveguide, but is absorbed or scattered.
  • a 2-photon absorption process Use a suitable longer wavelength excitation light which is guided over longer distances in the waveguiding layer (a), and thus stimulate the short-wave fluorescence.
  • a particular advantage of this variant of the method is that it eliminates the need to chemically link the analyte or one of its binding partners in a detection method with a luminescence label. Instead, the detection can be based directly on the detection of luminescent biological compounds which are present as a natural component of these compounds or which are incorporated into the analyte or one of its binding partners in a biological production process.
  • a special variant of the method according to the invention is characterized in that owing to the high amplification of an irradiated excitation light, on the layer (a) and in the layer (a), on the surface of the layer (a) or within a distance of less molecules located at 200 nm from layer (a) are held captive within this distance by the high excitation intensity near the surface and its increasing gradient in the direction of the surface exerting the effect of an “optical tweezers” on these molecules.
  • the inventive method according to one of the preceding embodiments enables simultaneous or sequential, quantitative or qualitative determination of one or more analytes, for example 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 factors 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 and / or a method according to the invention, in each case according to one of the aforementioned embodiments, for determining chemical, biochemical or biological analytes in screening processes in pharmaceutical research, combinatorial chemistry, clinical and preclinical development, real-time binding studies and the determination of kinetic parameters in affinity screening and research, 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, agrochemical product development and research, 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.
  • Another object of this invention is the use of a grating waveguide structure according to the invention and / or an optical system and / or a method according to the invention in non-linear optics or in telecommunications or communications technology.
  • 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 are also suitable for surface-bound investigations which require the use of very high excitation light intensities and / or excitation durations, such as, for example Studies on the photostability of materials, photocatalytic processes etc.
  • FIG. 1 shows a CCD camera image of a fluorescence after 2-photon excitation that is visible to the naked eye and generated with the aid of a waveguide structure according to the invention
  • a glass substrate AF45 glass as optical layer (b)
  • n 1,496 at 800 nm
  • a pulsed titanium sapphire laser with emission at approx. 800 nm serves as the excitation light source (pulse length: 100 fsec, repetition rate: 80 MHz, average power used: up to 0.6 W, spectral pulse width: 8 nm).
  • the intensity of the excitation light emitted by the laser can be continuously adjusted between 0% and 100% of the output power using an electro-optical modulator.
  • lenses can be used in the excitation beam path (in the direction of the waveguide structure) in order to generate excitation light bundles of the desired geometry which are irradiated in parallel on the coupling grating (c) of the waveguide structure.
  • the incident excitation light is deflected via a mirror onto the coupling grating (c) of the waveguide structure, which is mounted on an adjusting element, which translates in the x, y and z directions (parallel and in the axes perpendicular to the grating lines) and rotation (with the axis of rotation coinciding with the grid lines of the coupling grid).
  • a collimated beam is directed at the resonance angle for coupling onto the coupling grating.
  • the coupling grating level of the waveguide structure
  • the immobilized luminescent dye such a strong 2-photon fluorescence that it can be observed with the naked eye even in ambient light (Fig. 1, taken with an IR-suppressing filter (BG 39
  • the left bright light spot marks the coupling position of the excitation light on the coupling grating.
  • the coupled mode (at a wavelength of 800 nm) spreads from left to right in the image plane. Until the area where the rhodamine dye is immobilized, the guided fashion is invisible. In the direction of mode propagation, to the right, the fluorescence of the rhodamine dye generated by means of 2-photon excitation can then be clearly recognized.
  • the light track to be observed corresponds to a length of approx. 8 mm, up to the next grating structure at which the guided excitation light is coupled out again. A significant weakening of the guided light or the excited 2-photon fluorescence cannot be seen along the entire distance.
  • a high-power laser diode with an emission wavelength of 810 nm (fiber-coupled, 10 W) serves as the excitation light source.
  • a beam shaping optics arranged after the fiber, a parallel excitation beam bundle of the desired shape is generated and irradiated onto the grating (period 360 nm, grating depth 12 nm) at the coupling angle for coupling into the waveguiding layer (a) of the grating-waveguide structure.

Abstract

L'invention concerne un type de construction variable d'une structure réseau de guide d'onde optique, basée sur un guide d'onde plat en couches minces doté d'une première couche optique transparente (a) appliquée sur une deuxième couche optique transparente (b) d'un indice de réfraction inférieur à celui de la couche (a) et d'une structure réseau (c) modulée dans la couche optique transparente (a). L'invention est caractérisée en ce que l'intensité d'une lumière d'excitation à injecter dans la couche (a) sous l'angle de résonance est renforcée au moins d'un facteur 100, au moins dans la zone de la structure réseau (c), sur la couche (a) et dans la couche (a), comparativement à l'intensité de cette lumière d'excitation sur la surface d'un substrat sans injection de ladite lumière. L'invention concerne également un système optique comprenant une source de lumière d'excitation et un modèle de structure réseau de guide d'onde optique. Elle porte aussi sur un procédé pour renforcer l'intensité d'une lumière d'excitation et sur son application dans des procédés de détection bioanalytiques, dans l'optique non linéaire ou dans les télécommunications.
EP01936198A 2000-04-14 2001-04-06 Structure reseau de guide d'onde destine a intensifier un champ d'excitation et son utilisation Withdrawn EP1272829A1 (fr)

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