Materials, Photonic Devices, and Sensors

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

[+] Author Affiliations
Hanzheng Wang, Lei Yuan, Jie Huang, Xinwei Lan, Hai Xiao

Clemson University, Department of Electrical and Computer Engineering, Clemson, South Carolina 29634, United States

Cheol-Woon Kim

MO-SCI Corporation, 4040 HyPoint North, Rolla, Missouri 65401, United States

Opt. Eng. 55(6), 067105 (Jun 15, 2016). doi:10.1117/1.OE.55.6.067105
History: Received March 6, 2016; Accepted May 25, 2016
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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 2.5×105 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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Hanzheng Wang ; Lei Yuan ; Cheol-Woon Kim ; Jie Huang ; Xinwei Lan, et al.
"Integrated microsphere whispering gallery mode probe for highly sensitive refractive index measurement", Opt. Eng. 55(6), 067105 (Jun 15, 2016). ; http://dx.doi.org/10.1117/1.OE.55.6.067105


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