WO2011027016A1 - Capteurs à fibre optique recouverte basés sur la résonance due à des modes à pertes proches de l'état de coupure - Google Patents

Capteurs à fibre optique recouverte basés sur la résonance due à des modes à pertes proches de l'état de coupure Download PDF

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Publication number
WO2011027016A1
WO2011027016A1 PCT/ES2010/070574 ES2010070574W WO2011027016A1 WO 2011027016 A1 WO2011027016 A1 WO 2011027016A1 ES 2010070574 W ES2010070574 W ES 2010070574W WO 2011027016 A1 WO2011027016 A1 WO 2011027016A1
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sensor according
fiber
thin film
poly
absorbent material
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PCT/ES2010/070574
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English (en)
Spanish (es)
Inventor
Ignacio DEL VILLAR FERNÁNDEZ
Carlos RUIZ ZAMARREÑO
Miguel HERNÁEZ SÁENZ DE ZÁITIGUI
Francisco Javier ARREGUI SAN MARTÍN
Ignacio Raúl MATÍAS MAESTRO
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Universidad Pública de Navarra
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Publication of WO2011027016A1 publication Critical patent/WO2011027016A1/fr

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    • 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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G01N21/552—Attenuated total reflection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • 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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
    • 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
    • G01N2021/7706—Reagent provision
    • G01N2021/7736—Reagent provision exposed, cladding free

Definitions

  • the following invention relates to fiber optic sensors coated with a thin film of absorbent material.
  • the detection technique is based on the generation of one or several resonances originated by modes with losses close to the cut-off condition (the lossy mode resonance - MRL).
  • Actuators B 12: 213, 1993 Depending on the properties of the coatings that form the thin films, three different cases are distinguished.
  • the first case occurs when the real part of the permittivity of the absorbent material is negative and its absolute value is greater than the absolute value of its imaginary part and greater than the real part of the permittivity of the dielectric surrounding the thin film. In this case, there is a coupling between the light that propagates through the waveguide and a surface plasmon called surface plasmon resonance (SPR).
  • SPR surface plasmon resonance
  • the second case occurs when the real part of the permittivity of the material is positive and its absolute value greater than that of its imaginary part and also greater than the real part of the permittivity of the dielectric that surrounds the thin film.
  • the cutting condition marks the point from which a mode becomes guided in the coating and is fundamentally controlled by two variables: the wavelength of the light that is propagated by the waveguide and the width of the coating. If, for example, the wavelength remains fixed, there is a width from which a mode is guided in the coating. Therefore, for widths close to this value it can be said that the modes are close to the cutting condition and there is a transfer of energy between the waveguide and the coating that causes the appearance of resonance.
  • the third case occurs when the real part of the material that forms the thin coating approaches zero while its imaginary part is elevated. This case is known as long-range exciton polariton.
  • the metal surface comes into contact with the sample and, using a monochromatic polarized light in TM mode that crosses the prism and the measurement of the intensity of reflected light as a function of the angle of incidence, the SPR reflection spectrum is calculated of the sample.
  • the angle with minimum reflection intensity is the resonance angle at which the maximum coupling between the incident light and the surface plasmon waves originates. This angle, together with the resonance spectrum and the intensity at the angle at which the minimum reflection intensity is obtained, It can be used to characterize or determine the sample in contact with the metal surface.
  • SPR-based sensors have been described in the literature, sensitive to changes in both refractive index and sample thickness. These systems, together with the appropriate sensitive chemical coatings have led to the development of a wide variety of SPR-based chemical sensors (such as C. Nylander, B. Liedberg and T. Lindt, Sens. & Actuators, 4: 299, 1983 use angular scanning; K. Matsubara, S. Kawata and S, Minami, Appl. Opt, 27: 1 160, 1988 use a multiple linear detector; LM Zhang and D. Uttamchandani, Electron. Lett., 24: 1469, 1988 make a wavelength scan; Liedberg et al., Sens.
  • the object of the present invention is to present a new type of fiber optic devices that overcome the limitations of SPR sensors based on optical fiber, where resonance is only produced in the event that the polarization of the incident light is TM and where Multiple resonances can only be achieved by modifying the geometry of the substrate on which the coating is deposited.
  • the invention proposes a fiber optic sensor based on the phenomenon of resonance by modes with losses close to the cutting condition, which comprises: - an optical fiber with a waveguide core and at least one film of absorbent material located in a sensitive area in direct contact with at least a part of the fiber waveguide core
  • the film is formed by an absorbent material in which the real part of its permittivity is positive and its absolute value is greater than the absolute value of its imaginary part and greater than the real part of the permittivity of the dielectric surrounding the thin film and capable of producing at least one mode close to the cutting condition.
  • An additional advantage of the device of the invention is that the range of deposited materials capable of producing resonance goes from being practically limited to the use of metals (especially gold and silver) in the case of SPR, to the use of metals, semiconductors and any other material with absorbent properties such as polymers.
  • Some suitable materials are polymers deposited with the monolayer electrostatic self-assembling technique or with the Langmuir Blodgett technique which, due to the fact that they are constituted by multiple layers of molecular size linked together, acquire a roughness that translates into a part value Imagination of non-zero permittivity in the aforementioned optical range.
  • Another group of materials are transparent conductive metal oxides, which after an adequate parameterization (thickness, tempered, doped, etc.), also meet the above conditions for polymers in the ultraviolet, visible and, depending on the parameterization, in the infrared
  • the deposition process of the thin film must take into account that the deposition is carried out on a substrate that is the fiber itself, being necessary the adequate adaptation of the deposition process used to said substrate.
  • the sensor may be based on direct transmission, where the radiation source is applicable to the input end of the fiber optic core so that the radiation is propagated through the fiber by total internal reflection from the input end to the end. of exit, or based on reflection, where the propagation mechanism is also by total internal reflection, but when the light reaches the other end, a specular layer in contact with the end of the waveguide core, causes the light to reflect The original end.
  • the radiation source is applicable to the input end of the fiber optic core so that the radiation is propagated through the fiber by total internal reflection from the input end to the end. of exit, or based on reflection, where the propagation mechanism is also by total internal reflection, but when the light reaches the other end, a specular layer in contact with the end of the waveguide core, causes the light to reflect The original end.
  • at least one additional layer of particles sensitive specifically to the species to be detected can be incorporated into the absorbent material film.
  • the sensitive area may be in the center of the guide or at the end in reflection.
  • the preferred compound for the thin film is (without the invention limiting this) a transparent conductive metal oxide of an element chosen from the elements zinc, indium, tin, iridium, cadmium, yttrium, scandium and nickel, or alloys, doped or binary, ternary or quaternary combinations of the oxides of the above elements among themselves, with other elements such as fluorine, copper, gallium, magnesium, calcium, strontium or aluminum or combinations of the latter among them.
  • polymers obtained from the elements poly (vinyl pyrrolidone), poly (vinyl alcohol), polyacrylamide, polyacrylic acid, polystyrene sulfate, polyaniline sulfate, poly (thiophene-3-acetic acid), polyaniline, polypyrrole, poly (3-hexyl thiophene) ), poly (3,4-ethylenedioxythiophene) and poly (dimethyl ammonium dichloride).
  • the film can be of a thickness adapted to generate multiple resonances.
  • the senor may incorporate another optical fiber capable of generating an output reference signal.
  • the source of electromagnetic radiation can consist of an LED, an array of LEDS, a semiconductor laser or a halogen lamp.
  • the light detection system will be adapted to detect the wavelengths produced by the chosen source.
  • the detector device preferably comprises a spectrometer.
  • the specular layer comprises a material of high reflectivity, preferably gold, silver, chromium, aluminum or platinum.
  • Figure 1 a - Schematic representation of the operation of the transmission configuration when a broad-spectrum white light source is used as the emitting device.
  • Figure 1 b Schematic representation of the operation of the configuration in reflection when a broad-spectrum white light source is used as the emitting device.
  • FIG 2 Detailed representation of the sensitive part of the resonance-based fiber optic device caused by modes with losses close to the cut condition in the online transmission based configuration shown in Figure 1 a.
  • FIG 3a Detailed representation of the sensitive part of the resonance-based fiber optic device caused by modes with losses close to the cut condition in the reflection-based configuration shown in Figure 1 b.
  • Figure 3b Detailed representation of a second embodiment of the reflection-based configuration, where the sensitive part of the resonance-based fiber optic device originated by modes with losses close to the cutting condition is at the end of the fiber.
  • Figure 4a Representation of the cross-sectional and longitudinal section to the direction of light propagation by the sensor.
  • Figure 4b Representation of the cross-sectional and longitudinal section to the direction of light propagation by the sensor, in which an additional sensitive layer is included.
  • Figure 5 Spectral responses in sensor absorption for different refractive indices on the thin film and for a small width thereof.
  • Figure 6 Wavelength variation of the resonance peak for different refractive indices on the thin film and for a small width thereof.
  • Figure 7 Spectral responses in sensor transmission for two different refractive indices on the thin film and for a large width thereof.
  • the fiber optic sensor device coated with absorbent material (the real part of its permittivity is positive and with absolute value greater than that of its imaginary part and also greater than the real part of the permittivity of the dielectric surrounding the thin film) is suitable for the generation of one or several MRLs originated by modes with losses close to the cutting condition.
  • Said device combines the advantages of the elimination of the optical prism of the Kretschmann configuration mentioned above in favor of a design in fiber optic, portable, of small size and with the possibility of performing remote measurements and multiplexing, together with the advantage of using a material absorbent that, in conditions where the width of the thin film of absorbent material allows for a TE mode with losses close to the cutting condition, a TM mode with losses close to the cutting condition, or the combination of both, will be generated an MRL in the spectrum in transmission or in reflection whose displacement in the ultraviolet, visible or infrared range will allow measurements of chemical, biomedical or environmental parameters.
  • the sensor of the invention can be used in the same applications as SPR sensors.
  • the device is highly sensitive to changes in the surrounding environment, so simply by adding, on the absorbent material, a layer sensitive to the parameter to be detected, chemical, environmental, biochemical sensors, etc. can be developed. Without said sensitive layer, sensor devices can also be developed based on the variation of the index of the external medium (refractometers), based on the variation of the properties of the film, or even optical filters.
  • the fact that the MRL is produced for angles that approximate the propagation of light by the fiber is very suitable, because after traveling a distance from the end of the fiber through which light is introduced, it tends to adopt these angles for the most part.
  • a thin film of absorbent material is deposited, which makes it possible to adjust its manufacturing parameters so that the MRL is in the appropriate range of electromagnetic spectrum wavelengths.
  • the combinations are very varied. If a single MRL is generated, it can be placed in one of the infrared windows, leaving other visible wavelengths free, for example to perform complementary measures such as absorption or fluorescence.
  • the width of the film will determine the sensitivity of this unique MRL.
  • the resonance sensitivity is also modified, which decreases with increasing thickness. In other words, the benefit of generating multiple resonances by increasing the thickness occurs to the detriment of a decrease in sensitivity.
  • Another possibility is to increase the thickness of the thin film of absorbent material to generate several MRLs distributed over the ultraviolet, visible and infrared range. Each of them will have a different sensitivity, which will allow multiple measures to improve errors caused by interference and noise.
  • the MRL itself, it generates an attenuation band in the electromagnetic spectrum.
  • the central wavelength of the MRL will experience variations depending on the parameters that are detected, reaching very large variations of up to 470 nm, as seen in Fig. 6.
  • the tuning of the MRL in the ultraviolet, the visible or the infrared is allowed through the manufacturing parameters of the coating of absorbent material, the need to introduce polarized light is eliminated, it is enhanced
  • the effect of the MRL thanks to the confinement that the optical fiber exerts on the light beam, and what is still more novel and advantageous, can be controlled with the width of the film
  • the sensitivity of the MRL and the appearance of several MRLs in the electromagnetic spectrum are thin, as shown in Fig. 7. As the width increases, more modes are guided in the absorbent material. Therefore, at each wavelength where it is fulfilled that the mode is located near the cut-off condition, the MRL will occur. In the case of Fig. 7, a width of about 440 nm is available, which causes the appearance of 4 MRLs in the spectrum. Each of them will have a different behavior, which implies different data for the monitoring of parameters.
  • This device uses, to couple light to the optical fiber (3), a "broad spectrum” light source (1) with multiple wavelengths, where "broad spectrum” means a minimum of two wavelengths although a wide enough range to cover the resonance spectrum of the sample, such as a white light source or black body radiation.
  • the range of angles will be defined by the numerical aperture of the optical fiber.
  • optical fibers that can be used for the present invention include all commercial ones that allow the transmission of light by internal total reflection. Such fibers will generally be characterized by three parameters: fiber core material, numerical fiber aperture and fiber optic core diameter. The choice of one type or another of optical fiber will vary the position of the resonance peak (the wavelength at which the MRL takes place).
  • FIG. 1 a and 1 b The embodiment of this device is presented in two preferred configurations as shown in FIG. 1 a and 1 b. These configurations are based on optical detection systems based on reflection and transmission respectively.
  • an additional element (12) located at one end of the optical fiber (1 1) is necessary, so that it reflects in reverse the light that propagates to through the fiber, which can consist of a layer of a highly reflective metal, such as gold, silver or chrome, adhered to the end of the fiber and thick enough to provide adequate reflection. It also requires a coupler (FIG. 1b, ref. 4).
  • the use of the present invention for the detection of the sample is carried out, by placing the sample (13) on the thin film of absorbent material (9) deposited on the optical fiber.
  • This movie is deposited in different places depending on the configurations used (5) in FIGS 2, 3a and 3b.
  • the process of deposition of the thin film (9) is carried out by removing the cover (8) adhered to the core of the optical fiber (6) and the subsequent deposition of the material itself in the exposed area of the core (7).
  • the thin film (9) is exposed to the sample (13) as shown in FIG. 4a thus allowing to determine the refractive index of the sample through the MRL (s) generated by combining the power coupling to the TE and TM modes close to the cut in the thin film.
  • a variant of this consists in the deposition of an additional sensitive layer (14) that will act as a mediator between the sample (13) and the thin film (9) as shown in FIG. 4b
  • the removal of the fiber cover is carried out through the use of known techniques, such as the use of appropriate chemical agents or tools.
  • the thin film is adhered by using known techniques.
  • the characteristics of the absorbent material are that the imaginary part of its permittivity is non-zero. In addition, its real part will be positive and greater in absolute value than the permittivity of the surrounding dielectric (fiber and external medium) and its imaginary part.
  • Tin doped indium oxide (ITO) meets this condition in ultraviolet, visible and infrared (200-1500nm).
  • a single optical fiber can contain one or more thin films of the same or different types, with the same or with different geometries and located along or at the end of it.
  • any core portion exposed in the optical fiber can be used to place the thin film thereon, although one of the preferred embodiments consists in removing the entire circumference of the shell surrounding the core and depositing the thin film symmetrically and with uniform thickness over the exposed core area.
  • a detection system (2) suitable for the present invention will consist of any device capable of detecting the intensity of all or a part of the wavelengths that exit through the optical fiber.
  • Detector device can be used a spectrometer capable of measuring the intensity of light as a function of wavelength.
  • the optical power injected by the emitting device (1) at one end of the optical fiber (3) travels through it through the sensitive area and reaching the detector device (2) directly in the case of the transmission configuration, FIG. 1 a, or once reflected by the specular layer (12) in the case of the configuration in reflection, FIG. 1 B.
  • This optical power that reaches the detector device is a function of the refractive index of the external medium in contact with the thin film (9), by which the mode close to the cutting condition that is guided by the fiber (6) is guided. ) to be guided in the thin film (9).
  • the sensor device can also incorporate a dynamic self-calibration signal by bifurcation of the optical fiber that comes from the light source so that we have a reference signal of the light that passes through the optical fiber without being affected by the sensitive area .
  • the sensor device can be used in multiple applications: refractometers, optical filters, and in the chemical or biochemical field, for the detection of species that are present in liquid or gas solutions.
  • the thin film of absorbent material can be coated with one or more additional layers that include immobilized compounds, specifically sensitive to the species to be detected (for example enzymes and coenzymes, antigens and antibodies, etc.).
  • immobilized compounds specifically sensitive to the species to be detected (for example enzymes and coenzymes, antigens and antibodies, etc.).
  • immobilized compounds specifically sensitive to the species to be detected
  • most biological reactions occur in the ultraviolet range, so the possibility of obtaining resonances in this range will allow sensors to adapt to these applications.
  • the refractive index and the thickness of the additional layer must also be suitable for the application. This layer also provides protection against external physical and chemical agents that can damage or affect the behavior of the sensor.
  • This embodiment is based on an optical transmission system in line transmission like the one shown in FIG. 1 a.
  • the light source used (1) corresponds to a DH-2000-H halogen light lamp (Avantes Inc.)
  • the optical fiber used corresponds to a silica optical fiber with polymeric cover and buffer of diameters 200/225/500 ⁇ for the core, cover and buffer respectively, and numerical aperture 0.39 (Thorlabs Inc.).
  • the buffer was removed by using the appropriate tools while the cover was removed by chemical procedures for several fibers with lengths of 1 cm, 2cm, 4 cm and 7cm. Once the fiber core was exposed, the dip-coating technique was used, which will allow us a homogeneous deposition of an 85 nm film of transparent conductive metal oxide (ITO on the optical fiber), resulting in the sensitive area that is represented in FIG. 2.
  • ITO transparent conductive metal oxide
  • the fiber optic output was connected to a NIR-512 spectrometer (Oceanoptics Inc.) with a detection range between 850 nm - 1700 nm and a spectral resolution of less than 5 nm using an SMA connection and connected in turn to a computer for the acquisition of the spectra.
  • a NIR-512 spectrometer (Oceanoptics Inc.) with a detection range between 850 nm - 1700 nm and a spectral resolution of less than 5 nm using an SMA connection and connected in turn to a computer for the acquisition of the spectra.
  • This variation assumes a sensitivity of 1.74x10 "4 units of refractive index per nanometer. If you want to cover a range of indexes of higher refraction, the option is to use a wider width of ITO. In the case of 1 15 nm, indices between 1.321 (water) to 1.46 (glycerin) can be monitored. This has a dynamic range of 0.14 units of refractive index, which could be increased in case of measuring solutions of another substance.
  • FIG. 7 shows the effect of depositing a film of absorbent material of width 440 nm.
  • the increase in width causes a greater number of modes to be guided in the film, which results in a greater number of wavelengths at which the condition of proximity to the cut is fulfilled in a film-guided manner.
  • An MRL is generated in each of these wavelengths.
  • FIG. 7 shows up to 4 MRLs that for an external water medium have their central wavelength at wavelengths 310 nm, 471 nm, 726 nm and 1257 nm.
  • the device has been oriented to the field of sensors, and more specifically to chemical or biochemical applications, it can also be used as an optical sensor to detect the variation of any physical or chemical parameter that affects the optical properties of the external medium under control and you can even leave the field of sensors to be used as an optical filter of various wavelengths in optical communications.

Abstract

L'invention concerne un dipositif de capteur à fibre optique recouverte basé sur la résonance due à des modes à pertes proches de l'état de coupure (en anglais, lossy mode resonance-LMR) grâce à l'utilisation d'un film mince de matériau absorbant placé sur le noyau de la fibre optique. Ce dispositif allie les avantages de l'élimination du prisme optique de la configuration de Kretschmann en faveur d'une conception en fibre optique, portable, de petite taille avec possibilité de réaliser des mesures à distance et un multiplexage. Le dispositif présente également comme avantage le fait qu'il évite d'avoir à recourir à l'utilisation d'une lumière polarisée en mode TM, ce qui est nécessaire avec des capteurs basés sur la résonance de plasmons superficiels. En fonction de la largeur du film mince, on peut régler la sensibilité du dispositif et générer de multiples résonances dans le spectre éelctromagnétique, ce qui permet en outre son utilisation comme filtre optique.
PCT/ES2010/070574 2009-09-07 2010-08-31 Capteurs à fibre optique recouverte basés sur la résonance due à des modes à pertes proches de l'état de coupure WO2011027016A1 (fr)

Applications Claiming Priority (2)

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ES200930656A ES2363285B2 (es) 2009-09-07 2009-09-07 Sensores de fibra optica recubierta basados en resonancia originada por modos con perdidas cercanos a la condicion de corte
ESP200930656 2009-09-07

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN102788757A (zh) * 2012-08-28 2012-11-21 中国计量学院 一种基于透射式光纤传感器的水质色度检测装置
CN106872405A (zh) * 2017-01-05 2017-06-20 深圳大学 一种基于双层石墨烯的生物传感器芯片
CN109655434A (zh) * 2019-02-22 2019-04-19 东北大学 一种多参数测量的光纤lmr传感器

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