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Related Experiment Video

Updated: Mar 26, 2026

Fabrication and Testing of Photonic Thermometers
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Fabrication and Testing of Photonic Thermometers

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Highly sensitive optical temperature sensor based on a SiN micro-ring resonator with liquid crystal cladding.

Chun-Ta Wang, Cheng-Yu Wang, Jui-Hao Yu

    Optics Express
    |February 3, 2016
    PubMed
    Summary
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    This study presents a novel optical temperature sensor using silicon nitride micro-ring resonators with liquid crystal cladding. This design significantly enhances temperature sensitivity for precise measurements.

    Area of Science:

    • Photonics
    • Materials Science
    • Sensor Technology

    Background:

    • Optical sensors are crucial for precise temperature monitoring.
    • Silicon nitride (SiN) micro-ring resonators offer a platform for sensitive optical measurements.
    • Nematic liquid crystals (NLCs) exhibit significant refractive index changes with temperature.

    Purpose of the Study:

    • To develop a highly sensitive optical temperature sensor.
    • To leverage the thermo-optic properties of NLCs for enhanced sensing.
    • To investigate the performance of SiN micro-ring resonators with NLC cladding.

    Main Methods:

    • Fabrication of a SiN micro-ring resonator.
    • Integration of NLC cladding with the micro-ring structure.
    • Measurement of resonance wavelength shifts in response to temperature variations.

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    Main Results:

    • Achieved a temperature sensitivity of 1 nm/°C (TM-polarized light) between 25-33 °C.
    • Observed sensitivity exceeding 2 nm/°C near the NLC clearing temperature.
    • Demonstrated a sensitivity at least 55 times greater than SiN resonators with air cladding.

    Conclusions:

    • The NLC-clad SiN micro-ring resonator is a highly sensitive optical temperature sensor.
    • The large thermo-optic coefficient of NLCs dramatically enhances sensor performance.
    • This technology offers a significant improvement over existing micro-ring resonator-based temperature sensors.