Refractive index sensing by Brillouin scattering in side-polished optical fibers

In this Letter, we demonstrate the possibility to measure the refractive index of a liquid, using the stimulating Brillouin scattering in a 3-cm-long side-polished optical fiber. In addition, we show that by depositing a high-refractive index layer on the polished surface the sensitivity of the Bril...

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Veröffentlicht in:Optics letters 2018-05, Vol.43 (10), p.2280-2283
Hauptverfasser: Bernini, Romeo, Persichetti, Gianluca, Catalano, Ester, Zeni, Luigi, Minardo, Aldo
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Sprache:eng
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Zusammenfassung:In this Letter, we demonstrate the possibility to measure the refractive index of a liquid, using the stimulating Brillouin scattering in a 3-cm-long side-polished optical fiber. In addition, we show that by depositing a high-refractive index layer on the polished surface the sensitivity of the Brillouin frequency shift (BFS) can be increased due to a higher penetration of the evanescent field in the outer medium. Experiments show a maximum BFS change of about 11 MHz when varying the refractive index of the external medium from 1 (air) to 1.402, and a BFS sensitivity to refractive index of about 293 MHz/RIU around 1.40.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.43.002280