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2017-04-28 - Colloque/Article dans les actes avec comité de lecture - Anglais - 4 page(s)

Gonzalez Vila Alvaro , Lopez-Aldaba Aitor, Kinet Damien , Mégret Patrice , Lopez-Amo Manuel, Caucheteur Christophe , "Optical power-based interrogation of plasmonic tilted fiber Bragg grating biosensors" in 25th International Conference on Optical Fiber Sensors (OFS 25), 10323, 103234V, Jeju, South Korea, 2017

  • 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) Two interrogation techniques for plasmonic tilted fiber Bragg grating sensors are reported and experimentally tested. Typical interrogation methods are usually based on tracking the wavelength shift of the most sensitive cladding mode, but for biosensing applications, spectrometer-based methods can be replaced by more efficient solutions. The proposed techniques thus rely on the measurement of the induced changes in optical power. The first one consists of a properly polarized tunable laser source set to emit at the wavelength of the sensor most sensitive mode and an optical power meter to measure the transmitted response. For the second method, a uniform fiber Bragg grating is photo-inscribed beyond the sensor in such a way that its central wavelength matches the sensor most sensitive mode, acting as an optical filter. Using a LED source, light reflected backwards by this grating is partially attenuated when passing through the sensor due to plasmon wave excitation and the power changes are quantified once again with an optical power meter. A performance analysis of the techniques is carried out and they both result competitive interrogation solutions. The work thus focuses on the development of cost-effective alternatives for monitoring this kind of biosensors in practical situations.