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Proceedings Paper

A dispersion sensor using whispering gallery modes in a cylindrical micro-cavity
Author(s): Rui Yang; Yang Bao; Wen-Hua Yu; Xiang-Long Wang; Yi-Tao Ren; Xiao-Yun Pu
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Paper Abstract

Whispering gallery modes (WGM) in a cylindrical micro-cavity of a silica optical fiber are excited with a tapered fiber of ~7μm in diameter by evanescence field, and the WGM spectra of the cylindrical micro-cavity with different diameters (300μm, 400μm and 500μm) are measured. The resonant positions and their separations of the spectra are assigned precisely by an asymptotic formula. Considering the fiber dispersion and the errors induced from it, the values of the resonant position and its separation achieved from assignment within the experimental spectra range (1290~1320 nm) match well with a theoretical calculation and a measured accuracy of the refractive index of the micro-cavity can be as high as 10-5, which indicates that a dispersion sensor can be formed by measuring the dispersive features of WGM in a cylindrical micro-cavity.

Paper Details

Date Published: 3 February 2009
PDF: 9 pages
Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 71570Z (3 February 2009); doi: 10.1117/12.806922
Show Author Affiliations
Rui Yang, Yunnan Univ. (China)
Yang Bao, Yunnan Univ. (China)
Wen-Hua Yu, Yunnan Univ. (China)
Xiang-Long Wang, Yunnan Univ. (China)
Yi-Tao Ren, Yunnan Univ. (China)
Xiao-Yun Pu, Yunnan Univ. (China)


Published in SPIE Proceedings Vol. 7157:
2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications

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