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Updated: Dec 9, 2025

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Fiber micro-tip temperature sensor based on cholesteric liquid crystal.

Jianyang Hu, Dong Zhou, Yueming Su

    Optics Letters
    |September 15, 2020
    PubMed
    Summary
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    A novel fiber-tip temperature sensor uses liquid crystals in a capillary tube to measure temperature. This compact, biocompatible sensor offers high sensitivity and potential for cell-level biochemical detection.

    Area of Science:

    • Photonics
    • Materials Science
    • Sensor Technology

    Background:

    • Accurate temperature sensing is crucial in various scientific fields.
    • Miniaturized sensors are needed for applications like cell-level measurements.
    • Cholesteric liquid crystals (CLCs) exhibit unique optical properties.

    Purpose of the Study:

    • To propose and demonstrate a novel, miniature fiber-tip temperature sensor.
    • To utilize dye-doped CLCs within a tapered hollow capillary tube (HCT) for temperature sensing.
    • To investigate the sensor's performance, including sensitivity and figure of merit.

    Main Methods:

    • Fabrication of a fiber-tip sensor using a tapered HCT filled with glycerin and dye-doped CLC.
    • Glycerin acts as an anchoring agent for uniform CLC molecular orientation, forming a mirrorless photonic bandgap (PBG) microcavity.

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  • Characterization of the sensor's emission spectra and temperature-dependent performance.

    • Main Results:

    • The sensor exhibits an unambiguously identifiable PBG mode single peak in its emission spectra.
    • Achieved temperature sensitivity of -9.167 nm/°C.
    • Figure of merit reached 67.4 °C⁻¹, indicating high performance.

    Conclusions:

    • The developed CLC-based fiber-tip sensor is compact, biocompatible, and offers unambiguous temperature readings.
    • Demonstrated novel integration of CLC into an optical fiber terminal for PBG mode excitation and transmission.
    • The sensor shows significant potential for diverse temperature sensing applications, including biochemical detection at the cellular level.