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Related Experiment Video

Updated: Dec 9, 2025

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Humidity sensor based on a graphene oxide-coated few-mode fiber Mach-Zehnder interferometer.

X Fan, Q Wang, M Zhou

    Optics Express
    |September 10, 2020
    PubMed
    Summary
    This summary is machine-generated.

    A novel graphene oxide-coated fiber optic sensor offers high sensitivity for detecting relative humidity. This compact and easily manufactured device shows promise for chemical and biochemical sensing applications.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics Sensors
    • Nanomaterials

    Background:

    • Relative humidity (RH) monitoring is crucial in various environmental and industrial applications.
    • Fiber optic sensors offer advantages like immunity to electromagnetic interference and remote sensing capabilities.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel relative humidity sensor.
    • To investigate the performance of a graphene oxide-coated few-mode fiber Mach-Zehnder interferometer for humidity sensing.

    Main Methods:

    • Fabrication of a Mach-Zehnder interferometer (MZI) using few-mode fiber (FMF) spliced between no-core fibers (NCF) and single-mode fibers (SMF).
    • Corrosion of FMF cladding with hydrofluoric acid followed by natural deposition of graphene oxide (GO) film.
    • Characterization of the sensor's response to varying relative humidity levels by monitoring wavelength shifts.

    Main Results:

    • The sensor exhibited humidity sensitivity of 0.191 nm/%RH in the 30-55% RH range and 0.061 nm/%RH in the 55-95% RH range.
    • The refractive index of the GO film changed upon water molecule absorption, altering the MZI's phase difference and causing resonant dip wavelength shifts.
    • Experimental validation of the sensor's performance with high sensitivity.

    Conclusions:

    • The proposed graphene oxide-coated FMF-MZI sensor demonstrates effective and sensitive detection of relative humidity.
    • The sensor's compact size, simple fabrication, and high sensitivity make it suitable for chemical and biochemical sensing applications.