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2017-11-01 - Article/Dans un journal avec peer-review - Anglais - 6 page(s)

Gonzalez Vila Alvaro , Kinet Damien , Mégret Patrice , Caucheteur Christophe , "Narrowband interrogation of plasmonic optical fiber biosensors based on spectral combs" in Optics & Laser Technology, 96, 141-146, 10.1016/j.optlastec.2017.05.015

  • Edition : Elsevier Science
  • Codes CREF : Capteurs et périphériques (DI2563), Optique des fibres (électromagnétisme) (DI1252)
  • Unités de recherche UMONS : Electromagnétisme et Télécommunications (F108)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)

Abstract(s) :

(Anglais) 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.