期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 383, 期 -, 页码 146-152出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2013.05.005
关键词
Optical fiber; Sensor; Fiber tapering; Absorption; Surface plasmon resonance
Dependence of taper angle of the surface plasmon resonance (SPR)-based fiber optic sensor on the SPR absorption and sensitivity was investigated. The SPR wavelength was found to increase from 700 nm to 1200 nm with the increase of the refractive index of the surrounding oils from 1.404 to 1.434. The SPR sensitivity increased with the increase of metal-coated taper angle (Omega) from 0.07 degrees to 1.86 degrees by changing the down/up tapering length or waist diameter. The absorption intensity of the SPR spectrum was found to decrease and the FWHM was broadened with the increase of refractive index of the index matching oils (n = 1.404-1.434) due to the leakage of the power fraction of guided rays into the surrounding medium and the spatial spreading and scattering of the conduction electrons, respectively. (C) 2013 Published by Elsevier B.V.
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