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Optical Engineering

Integrated microsphere whispering gallery mode probe for highly sensitive refractive index measurement
Author(s): Hanzheng Wang; Lei Yuan; Cheol-Woon Kim; Jie Huang; Xinwei Lan; Hai Xiao
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Paper Abstract

We report an integrated whispering gallery mode microresonator–based sensor probe for refractive index sensing. The probe was made by sealing a borosilicate glass microsphere into a thin-wall glass capillary pigtailed with a multimode optical fiber. The intensities of the resonant peaks were found decreasing exponentially (linearly in a log scale) with the increasing refractive index of the medium surrounding the capillary. The sensing capability of the integrated probe was tested using sucrose solutions of different concentrations and the resolution was estimated to be about 2.5×10−5 in the index range of 1.3458 to 1.3847. The integrated sensor probe may prove useful in many chemical and biological sensing applications where highly sensitive refractive index monitoring is needed.

Paper Details

Date Published: 15 June 2016
PDF: 4 pages
Opt. Eng. 55(6) 067105 doi: 10.1117/1.OE.55.6.067105
Published in: Optical Engineering Volume 55, Issue 6
Show Author Affiliations
Hanzheng Wang, Clemson Univ. (United States)
Lei Yuan, Clemson Univ. (United States)
Cheol-Woon Kim, MO-SCI Corp. (United States)
Jie Huang, Clemson Univ. (United States)
Xinwei Lan, Clemson Univ. (United States)
Hai Xiao, Clemson Univ. (United States)

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