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Proceedings Paper

Thermal sensing based on whispering gallery modes in tapered-fiber-coupled liquid crystal microdroplets
Author(s): Yan Wang; Hanyang Li; Liyuan Zhao; Yongjun Liu; Shuangqiang Liu; Jun Yang
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Paper Abstract

We report the efficient coupling of optical whispering gallery modes (WGMs) in liquid crystal microdroplets suspended in immiscible aqueous environment. Individual nematic liquid crystal (NLC) microdroplet is confined at the tip of a microcapillary used to generate the microdroplets and coupled through a tapered optical fiber waveguide positioned in the vicinity of the microdroplets. Efficient coupling of WGMs is observed in the NLC microdroplets with a diameter of 50–150 μm. In addition, the wavelengths of the WGMs can be tuned by temperature, making such NLC microdroplets suitable for thermal sensors. A temperature sensitivity of 0.244 nm/°C is achieved in a 75-μm-diameter microdroplet. The estimated thermal resolution of the microdroplet sensor is 8.2 × 10-2 °C.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 1032339 (23 April 2017); doi: 10.1117/12.2264901
Show Author Affiliations
Yan Wang, Harbin Engineering Univ. (China)
Hanyang Li, Harbin Engineering Univ. (China)
Liyuan Zhao, Harbin Engineering Univ. (China)
Yongjun Liu, Harbin Engineering Univ. (China)
Shuangqiang Liu, Harbin Engineering Univ. (China)
Jun Yang, Harbin Engineering Univ. (China)

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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