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Open AccessArticle

Sensing Characteristics of Side-Polished Fiber Based on the Alterations in Helical Structure of Thermo-Sensitive Cholesteric Liquid Crystals

by 1,2,*, 1 and 3
1
Guangdong Vocational College of Post and Telecom, Guangzhou 510630, China
2
School of Network and Continuing Education, Beijing University of Posts and Telecommunications, Beijing 510630, China
3
China Tower Corporation Limited Guangdong Branch, Guangzhou 510000, China
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(9), 465; https://doi.org/10.3390/cryst9090465
Received: 19 July 2019 / Revised: 30 August 2019 / Accepted: 1 September 2019 / Published: 5 September 2019
(This article belongs to the Special Issue Advances in Cholesteric Liquid Crystals)
Cholesteric liquid crystals (CLCs) are sensitive to environmental temperature changes, and have been employed as a specific intermediary for biosensors. Considering the temperature-dependent structural changes of CLCs, this study aimed to determine the sensing properties of side-polished fibers (SPFs) after coating with CLCs. The experimental results demonstrated that, with regard to the transmitted spectrum, the loss peak of CLC-coated SPFs exhibited a positive linear relationship with temperature changes over a range of 20 to 50 °C. The linear correlation coefficient achieved 97.8% when the temperature increased by 10 °C, and the loss peak drifted by 12.72 nm. The reflectance spectrum of CLCs coated on the polished surface were obtained using optical fiber sensors. The feasibility of measuring the helical structure of CLCs was further verified using SPF transmission spectroscopy. The findings indicated that the transmitted spectrum of SPFs could be adopted to characterize the helical structure of CLCs, which lays a solid foundation for further study on SPF-based biosensors. View Full-Text
Keywords: liquid crystal; cholesteric liquid crystals; optical fiber; side-polished fiber; sensor liquid crystal; cholesteric liquid crystals; optical fiber; side-polished fiber; sensor
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MDPI and ACS Style

Han, Y.; Jiang, Y.; Guo, W. Sensing Characteristics of Side-Polished Fiber Based on the Alterations in Helical Structure of Thermo-Sensitive Cholesteric Liquid Crystals. Crystals 2019, 9, 465.

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