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    This study introduces a new fiber-optic magnetic field sensor. It utilizes a graphene/Au membrane and Fabry-Perot interferometer to detect magnetic fields with high sensitivity.

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    Area of Science:

    • Optoelectronics
    • Nanotechnology
    • Sensor Technology

    Background:

    • Accurate magnetic field measurement is crucial for various scientific and industrial applications.
    • Existing sensors often face limitations in sensitivity, size, or cost.
    • Novel sensor designs are needed for enhanced performance in weak magnetic field detection.

    Purpose of the Study:

    • To develop and demonstrate a novel fiber-optic vector magnetic field sensor.
    • To investigate the sensing mechanism based on Ampere force and optical interference.
    • To evaluate the sensor's performance, including sensitivity and operating range.

    Main Methods:

    • Fabrication of a Fabry-Perot interferometer with a suspended graphene/Au membrane.
    • Integration of gold electrodes using femtosecond laser for current application.
    • Measurement of resonance wavelength shifts in response to applied magnetic fields.

    Main Results:

    • The sensor demonstrated magnetic field sensitivities of 5.71 pm/mT and 8.07 pm/mT in the ranges of 0–180 mT and 0–(-180) mT, respectively.
    • The sensor operates by converting magnetic field-induced Ampere force into optical wavelength shifts.
    • The device exhibits a compact structure and cost-effective manufacturing.

    Conclusions:

    • The proposed fiber-optic sensor offers a promising solution for weak magnetic field measurements.
    • Its design integrates nanotechnology (graphene/Au membrane) with optical interferometry.
    • The sensor's performance characteristics suggest potential for practical applications in diverse fields.