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2021-06-07 - Article/Dans un journal avec peer-review - Anglais - 12 page(s)

Ortega-Gomez Angel, Loyez Médéric , Lobry Maxime , Chah Karima , Zubi Joseba, Villatoro Joel, Caucheteur Christophe , "Plasmonic sensors based on tilted Bragg gratings in multicore optical fibers" in Optics Express

  • Edition : Optical Society of America (DC)
  • Codes CREF : Biochimie (DI3112), Optique des fibres (électromagnétisme) (DI1252)
  • Unités de recherche UMONS : Protéomie et Microbiologie (S828), Electromagnétisme et Télécommunications (F108)
  • Instituts UMONS : Institut des Biosciences (Biosciences)
Texte intégral :

Abstract(s) :

(Anglais) Bareandgold-coatedtiltedfiberBragggratings(TFBGs)cannowadaysbeconsidered as a mature technology for volume and surface refractometric sensing, respectively. As for other technologies, a continuous effort is made towards the production of even more sensitive sensors, thereby enabling a high-resolution screening of the surroundings and the possible detection of rare events. To this aim, we study in this work the development of TFBG refractometers in 4-core fibers. In particular, we show that the refractometric sensitivity of the cut-off mode can reach 100 nm/RIU for a bare grating. Using another demodulation method, a tenfold sensitivity increase is obtained when tracking the extremum of the SPR (surface plasmon resonance) envelope for a gold-coated TFBG configuration. Immobilization of DNA probes was performed as a proof-of-concept to assess the high surface sensitivity of the device.