Narrowband interrogation of plasmonic optical fiber biosensors based on spectral combs. Gonzalez Vila, A., Kinet, D., Mégret, P., & Caucheteur, C. Optics and Laser Technology, Elsevier, 01 November 2017. doi abstract bibtex Gold-coated tilted fiber Bragg gratings can probe surface Plasmon polaritons with high resolution and sensitivity. In this work, we report two configurations to interrogate such plasmonic biosensors, with the aim of providing more efficient alternatives to the widespread spectrometer-based techniques. To this aim, the interrogation is based on measuring the optical power evolution of the cladding modes with respect to surrounding refractive index changes instead of computing their wavelength shift. Both setups are composed of a broadband source and a photodiode and enable a narrowband interrogation around the cladding mode that excites the surface Plasmon resonance. The first configuration makes use of a uni- form fiber Bragg grating to filter the broadband response of the source in a way that the final interroga- tion is based on an intensity modulation measured in transmission. The second setup uses a uniform fiber grating too, but located beyond the sensor and acting as a selective optical mirror, so the interrogation is carried out in reflection. Both configurations are compared, showing interesting differential features. The first one exhibits a very high sensitivity while the second one has an almost temperature-insensitive behavior. Hence, the choice of the most appropriate method will be driven by the requirements of the target application.
@article{ORBi-24715430-7e55-410e-9253-3b35d4b9d9f2,
AUTHOR = {Gonzalez Vila, Alvaro and Kinet, Damien and Mégret, Patrice and Caucheteur, Christophe},
TITLE = {Narrowband interrogation of plasmonic optical fiber biosensors based on spectral combs},
LANGUAGE = {en},
YEAR = {01 November 2017},
DOI = {10.1016/j.optlastec.2017.05.015},
PUBLISHER = {Elsevier},
JOURNAL = {Optics and Laser Technology},
ISSN = {0030-3992},
VOLUME = {96},
ABSTRACT = {Gold-coated tilted fiber Bragg gratings can probe surface Plasmon polaritons with high resolution and sensitivity. In this work, we report two configurations to interrogate such plasmonic biosensors, with the aim of providing more efficient alternatives to the widespread spectrometer-based techniques. To this aim, the interrogation is based on measuring the optical power evolution of the cladding modes with respect to surrounding refractive index changes instead of computing their wavelength shift. Both setups are composed of a broadband source and a photodiode and enable a narrowband interrogation around the cladding mode that excites the surface Plasmon resonance. The first configuration makes use of a uni- form fiber Bragg grating to filter the broadband response of the source in a way that the final interroga- tion is based on an intensity modulation measured in transmission. The second setup uses a uniform fiber grating too, but located beyond the sensor and acting as a selective optical mirror, so the interrogation is carried out in reflection. Both configurations are compared, showing interesting differential features. The first one exhibits a very high sensitivity while the second one has an almost temperature-insensitive behavior. Hence, the choice of the most appropriate method will be driven by the requirements of the target application.}
}
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In this work, we report two configurations to interrogate such plasmonic biosensors, with the aim of providing more efficient alternatives to the widespread spectrometer-based techniques. To this aim, the interrogation is based on measuring the optical power evolution of the cladding modes with respect to surrounding refractive index changes instead of computing their wavelength shift. Both setups are composed of a broadband source and a photodiode and enable a narrowband interrogation around the cladding mode that excites the surface Plasmon resonance. The first configuration makes use of a uni- form fiber Bragg grating to filter the broadband response of the source in a way that the final interroga- tion is based on an intensity modulation measured in transmission. The second setup uses a uniform fiber grating too, but located beyond the sensor and acting as a selective optical mirror, so the interrogation is carried out in reflection. Both configurations are compared, showing interesting differential features. The first one exhibits a very high sensitivity while the second one has an almost temperature-insensitive behavior. Hence, the choice of the most appropriate method will be driven by the requirements of the target application.","bibtex":"@article{ORBi-24715430-7e55-410e-9253-3b35d4b9d9f2,\n\tAUTHOR = {Gonzalez Vila, Alvaro and Kinet, Damien and Mégret, Patrice and Caucheteur, Christophe},\n\tTITLE = {Narrowband interrogation of plasmonic optical fiber biosensors based on spectral combs},\n\tLANGUAGE = {en},\n\tYEAR = {01 November 2017},\n\tDOI = {10.1016/j.optlastec.2017.05.015},\n\tPUBLISHER = {Elsevier},\n\tJOURNAL = {Optics and Laser Technology},\n\tISSN = {0030-3992},\n\tVOLUME = {96},\n\tABSTRACT = {Gold-coated tilted fiber Bragg gratings can probe surface Plasmon polaritons with high resolution and sensitivity. In this work, we report two configurations to interrogate such plasmonic biosensors, with the aim of providing more efficient alternatives to the widespread spectrometer-based techniques. To this aim, the interrogation is based on measuring the optical power evolution of the cladding modes with respect to surrounding refractive index changes instead of computing their wavelength shift. Both setups are composed of a broadband source and a photodiode and enable a narrowband interrogation around the cladding mode that excites the surface Plasmon resonance. The first configuration makes use of a uni- form fiber Bragg grating to filter the broadband response of the source in a way that the final interroga- tion is based on an intensity modulation measured in transmission. The second setup uses a uniform fiber grating too, but located beyond the sensor and acting as a selective optical mirror, so the interrogation is carried out in reflection. 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