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Open AccessArticle

Liquid-Crystal-Filled Side-hole Fiber for High-Sensitivity Temperature and Electric Field Measurement

by Yijian Huang 1,2, Ying Wang 1,2,3,*, Chun Mao 1,2, Jingru Wang 1,2, Han Wu 1,2, Changrui Liao 1,2,3 and Yiping Wang 1,2,3
1
Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
2
Guangdong Laboratory of Artificial Intelligence and Digital Economy (SZ), Shenzhen University, Shenzhen 518060, China
3
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(11), 761; https://doi.org/10.3390/mi10110761
Received: 30 September 2019 / Revised: 27 October 2019 / Accepted: 7 November 2019 / Published: 10 November 2019
(This article belongs to the Special Issue IMCO 2019)
We propose a highly sensitive sensor based on a nematic liquid-crystal-filled side-hole fiber. The liquid crystal is precisely filled into an air hole of the optical fiber using a method of manually gluing in the fusion splicer. Due to the coupling between the liquid crystal waveguide and the fiber core, multiple response dips appear in the transmission spectrum of the device. When an external temperature or electric field variation is applied to the liquid crystal and its refractive index changes, the transmission spectrum of this device will shift accordingly. Temperature and electric field response tests were performed on the device in the experiment, and the obtained temperature and electric field sensitivities were as high as −1.5 nm/°C and 3.88 nm/Vpp, respectively. For the exhibited advantages of being easy to manufacture, low cost, and high sensitivity, the proposed sensor is very promising for actual application in temperature or weak electric field monitoring. View Full-Text
Keywords: side-hole fiber; liquid crystal; fiber optics sensors side-hole fiber; liquid crystal; fiber optics sensors
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MDPI and ACS Style

Huang, Y.; Wang, Y.; Mao, C.; Wang, J.; Wu, H.; Liao, C.; Wang, Y. Liquid-Crystal-Filled Side-hole Fiber for High-Sensitivity Temperature and Electric Field Measurement. Micromachines 2019, 10, 761.

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