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 |
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Format: | Artikel |
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. |
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ISSN: | 0146-9592 1539-4794 |
DOI: | 10.1364/OL.43.002280 |