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    This study presents a novel optomechanical magnetometer using a high-Q membrane resonator to detect magnetic fields. This device offers simultaneous DC/AC measurements and directional sensing without complex laser equipment.

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    Area of Science:

    • Optomechanics
    • Magnetometry
    • Nanoscale sensing

    Background:

    • Optomechanical magnetometers typically require narrow-linewidth lasers and frequency-locked optical cavities.
    • Existing devices face limitations due to probe light fluctuations, impacting measurement accuracy.

    Purpose of the Study:

    • To develop an optomechanical magnetometer that overcomes limitations of current technologies.
    • To enable simultaneous measurement of DC and AC magnetic fields with directional sensitivity.

    Main Methods:

    • Utilizing a high-Q membrane mechanical resonator coupled to magnetostrictive materials.
    • Employing a two-beam Fabry-Perot cavity for monitoring resonator response.
    • Demodulating frequency shifts of nondegenerate membrane modes for field direction detection.

    Main Results:

    • Demonstrated an optomechanical magnetometer with high sensitivity.
    • Achieved simultaneous DC and AC magnetic field measurements.
    • Successfully recognized the direction of 2D DC magnetic fields.

    Conclusions:

    • The developed magnetometer offers a robust alternative, free from probe light fluctuations.
    • This work paves the way for new methods in weak magnetic field measurements.
    • Eliminates the need for specialized laser and optical cavity equipment.