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Waveguide-integrated chip-scale optomechanical magnetometer.

Fernando Gotardo, Benjamin J Carey, Hamish Greenall

    Optics Express
    |November 29, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel optomechanical magnetometer using an on-chip optical waveguide for excitation and readout. This advancement enhances scalability and integrability for sensitive magnetic field sensing applications.

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    Area of Science:

    • Optomechanics
    • Nanoscale sensing
    • Integrated photonics

    Background:

    • Optomechanical magnetometers offer high sensitivity but face limitations in scalability and integration due to free-space or fiber optics.
    • Existing designs hinder widespread application and miniaturization of magnetic field sensors.

    Purpose of the Study:

    • To develop an integrated optomechanical magnetometer using on-chip optical waveguides.
    • To demonstrate high sensitivity and dynamic range using portable electronics for magnetic field sensing.

    Main Methods:

    • Fabrication of a silicon chip integrating a silica microdisk resonator magnetometer with a suspended optical waveguide.
    • Utilizing a galfenol (FeGa) magnetostrictive film on the microdisk resonator for magnetic field detection.
    • Optical excitation and readout via the integrated waveguide, enabling thermomechanical noise-limited sensitivity.

    Main Results:

    • Successful integration of optical excitation and readout via a suspended waveguide on a single chip.
    • Demonstrated high quality-factor optical whispering gallery mode resonances.
    • Achieved high sensitivity and dynamic range in ambient conditions using portable electronics.

    Conclusions:

    • The developed on-chip optomechanical magnetometer overcomes previous scalability and integration limitations.
    • The use of integrated waveguides and portable electronics shows promise for practical, widespread magnetic field sensing applications.
    • This technology enables sensitive magnetic field detection in a compact and potentially cost-effective manner.