Integrated microsphere whispering gallery mode probe for highly sensitive refractive index measurement

Hanzheng Wang; Lei Yuan; Cheol-Woon Kim; Jie Huang; Xinwei Lan; Hai Xiao

doi:10.1117/1.OE.55.6.067105

15 June 2016 Integrated microsphere whispering gallery mode probe for highly sensitive refractive index measurement

Hanzheng Wang, Lei Yuan, Cheol-Woon Kim, Jie Huang, Xinwei Lan, Hai Xiao

Author Affiliations +

Funded by: US National Institutes of Health (NIH)

Optical Engineering, Vol. 55, Issue 6, 067105 (June 2016). https://doi.org/10.1117/1.OE.55.6.067105

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.

Citation Download Citation

Hanzheng Wang, Lei Yuan, Cheol-Woon Kim, Jie Huang, Xinwei Lan, and Hai Xiao "Integrated microsphere whispering gallery mode probe for highly sensitive refractive index measurement," Optical Engineering 55(6), 067105 (15 June 2016). https://doi.org/10.1117/1.OE.55.6.067105

Published: 15 June 2016

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