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Related Experiment Video

Updated: Jan 17, 2026

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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Characterization of humidity sensing based on optical microbubble resonators.

Jialin Yao, Bo Liu, Zhenyu Liu

    Optics Express
    |September 23, 2025
    PubMed
    Summary

    This study introduces a novel humidity sensor using a graphene oxide-coated microbubble resonator. The sensor demonstrates high sensitivity and excellent performance for humidity detection.

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    Area of Science:

    • Photonics and Sensor Technology
    • Materials Science

    Background:

    • Whispering gallery mode (WGM) microbubble resonators (MRs) offer potential for sensitive detection.
    • Graphene oxide (GO) is a promising material for functionalizing sensor surfaces.

    Purpose of the Study:

    • To develop and characterize a novel humidity sensor based on a GO-coated WGM microbubble resonator.
    • To investigate the influence of GO film thickness on sensor performance.

    Main Methods:

    • Fabrication of MRs using melt discharging and a fiber-optic fusion splicer.
    • Preparation of GO films via multiple impregnation.
    • COMSOL simulations and experimental analysis of humidity effects on resonance wavelength shifts.

    Main Results:

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  • A GO-coated MR humidity sensor was successfully fabricated and tested.
  • A 1-μm GO film exhibited a sensitivity of 6.21pm/%RH (50%-65% RH), with improved performance compared to a 2-μm film.
  • The sensor demonstrated excellent repeatability, consistency, and improved response/recovery times.

    • Conclusions:

    • The GO-coated WGM MR is a viable platform for high-performance humidity sensing.
    • Optimizing GO film thickness is crucial for maximizing sensor sensitivity and response.
    • This technology shows promise for humidity, gas, and acoustic sensing applications.