Experimental study on depolarized GAWBS spectrum for optomechanical sensing of liquids outside standard fibers

We report an experimental study on the spectral dependence of depolarized guided acoustic-wave Brillouin scattering (GAWBS) in a silica single-mode fiber (SMF) on acoustic impedance of external materials. The GAWBS spectrum was measured when the acoustic impedance was changed from 1.51 to 2.00 kg/s·...

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Bibliographic Details
Published in:Optics express 2017-02, Vol.25 (3), p.2239
Main Authors: Hayashi, Neisei, Mizuno, Yosuke, Nakamura, Kentaro, Set, Sze Yun, Yamashita, Shinji
Format: Article
Language:English
Online Access:Get full text
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Summary:We report an experimental study on the spectral dependence of depolarized guided acoustic-wave Brillouin scattering (GAWBS) in a silica single-mode fiber (SMF) on acoustic impedance of external materials. The GAWBS spectrum was measured when the acoustic impedance was changed from 1.51 to 2.00 kg/s·mm . With increasing acoustic impedance, the linewidth increased; the dependence was almost linear with an acoustic impedance dependence coefficient of 0.16 MHz/kg/s·mm . Meanwhile, with increasing acoustic impedance, the central frequency linearly decreased with an acoustic impedance dependence coefficient of -0.07 MHz/kg/s·mm . These characteristics are potentially applicable to acoustic impedance sensing.
ISSN:1094-4087
DOI:10.1364/OE.25.002239