Abstract

This Letter proposes and demonstrates a novel, miniature fiber-tip temperature sensor with a tapered hollow capillary tube (HCT) filled with glycerin and dye-doped cholesteric liquid crystal (CLC). The function of glycerin is to provide a surface anchoring force to control the uniform orientation of CLC molecules, so that the CLC in the tapered HCT can be considered as a mirrorless photonic bandgap (PBG) microcavity. An unambiguously identifiable PBG mode single peak appears in the emission spectra of the sensor. The CLC-based fiber-tip temperature sensor has a temperature sensitivity of ${-}9.167\;{\rm nm}/^\circ {\rm C}$, and the figure of merit can reach $67.4^\circ {{\rm C}^{- 1}}$. This sensor offers key features and advantages, including compactness, unambiguous identifiability, and biocompatibility, which can satisfy requirements of temperature measurement in various temperature sensing application fields and has great potential for biochemical detection at cell level. In addition, the CLC was integrated into the optical fiber terminal, and the PBG mode is excited, collected and transmitted by the multimode fiber coupler, which is reported for the first time, to the best of our knowledge.

© 2020 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Temperature-dependent chirality of cholesteric liquid crystal for terahertz waves

Xin Zhang, Fei Fan, Yun-Yun Ji, and Sheng-Jiang Chang
Opt. Lett. 45(18) 4988-4991 (2020)

Plasmonic random laser from dye-doped cholesteric liquid crystals incorporating silver nanoprisms

Shu-Han Chang, Jin-Jei Wu, Chi-Ching Kuo, Shwu-Yun Tsay, Yao-Hui Chen, and Ja-Hon Lin
Opt. Lett. 45(18) 5144-5147 (2020)

Optical fiber sensor based on a cholesteric liquid crystal film for mixed VOC sensing

Yunhe Yang, Dong Zhou, Xiujuan Liu, Yongjun Liu, Shuangqiang Liu, Peixian Miao, Yanchao Shi, and Weimin Sun
Opt. Express 28(21) 31872-31881 (2020)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription