Journal
OPTICS LETTERS
Volume 45, Issue 18, Pages 5209-5212Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.402473
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Funding
- National Science Foundation of China [U1531102, 61107059]
- Fundamental Research Funds for the Central Universities
- National Natural Science Foundation of Heilongjiang [A2018002]
- Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics [ZWK1801]
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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 nm/degrees C, and the figure of merit can reach 67.4 degrees 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 PBC mode is excited, collected and transmitted by the multimode fiber coupler, which is reported for the first time, to the best of our knowledge. (C) 2020 Optical Society of America
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