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Liquid crystal filled surface plasmon resonance thermometer.

Mengdi Lu, Xinpu Zhang, Yuzhang Liang

    Optics Express
    |July 14, 2016
    PubMed
    Summary

    A new surface plasmon resonance (SPR) thermometer uses liquid crystal (LC) in a hollow fiber. This novel sensor accurately detects temperature changes by monitoring shifts in resonance wavelength, offering high sensitivity near LC phase transitions.

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    Area of Science:

    • Optoelectronics
    • Nanotechnology
    • Materials Science

    Background:

    • Accurate temperature monitoring is crucial across various scientific and industrial applications.
    • Existing thermometers may face limitations in sensitivity, size, or operational range.
    • Liquid crystals (LCs) exhibit temperature-dependent optical properties suitable for sensing.

    Purpose of the Study:

    • To demonstrate a novel surface plasmon resonance (SPR) thermometer.
    • To utilize a liquid crystal (LC) filled hollow fiber for temperature sensing.
    • To investigate the SPR response to temperature variations and phase transitions in LCs.

    Main Methods:

    • Fabrication of a hollow fiber coated internally with silver and filled with LC.
    • Experimental measurement and theoretical modeling of the SPR response to temperature.

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  • Analysis of resonance wavelength shifts corresponding to changes in LC refractive index.

    • Main Results:

    • Observed a decrease in LC refractive index with increasing temperature, detected via SPR wavelength shift.
    • Achieved temperature sensitivities of 4.72 nm/°C (20–34.5 °C) and 0.55 nm/°C (36–50 °C).
    • Noted a significant increase in sensitivity (by an order of magnitude) near the LC's nematic-isotropic phase transition.

    Conclusions:

    • The developed SPR thermometer based on LC-filled hollow fiber demonstrates effective temperature sensing.
    • The sensor exhibits high sensitivity, particularly around the LC phase transition temperature.
    • This technology holds potential for temperature monitoring, alarming, and extension to other physical parameter measurements.