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Magnetic field vector detection at the millitesla level using a YIG microcavity optical sensor.

Yanran Wu, Yongpan Gao, Yisu Yang

    Optics Express
    |April 12, 2025
    PubMed
    Summary

    A novel yttrium iron garnet (YIG) microcavity optical sensor achieves millitesla-level magnetic field vector detection. This sensor offers high sensitivity and a wide measurement range for magnetic field sensing applications.

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    Area of Science:

    • Photonics and Optics
    • Materials Science
    • Magnetometry

    Background:

    • Accurate magnetic field detection is crucial for various scientific and industrial applications.
    • Existing sensors often face limitations in sensitivity, range, or vector measurement capabilities.

    Purpose of the Study:

    • To propose and demonstrate a novel optical sensor for millitesla-level magnetic field vector detection.
    • To leverage the magneto-optic properties of yttrium iron garnet (YIG) in a microcavity structure.

    Main Methods:

    • Fabrication of a yttrium iron garnet (YIG) microcavity with a high quality factor (∼105).
    • Utilizing the change in dielectric constant of YIG due to external magnetic fields for refractive index sensing.
    • Analyzing spectral shifts (redshift) in the YIG microcavity spectrum with varying magnetic field strength and direction.

    Main Results:

    • Achieved millitesla-level magnetic field vector detection.
    • Demonstrated a maximum intensity sensitivity of 0.357 pm/mT and a saturation magnetic field strength of approximately 45 mT.
    • Enabled 360° magnetic field direction rotation detection with a maximum directional sensitivity of 0.132 pm/rad.

    Conclusions:

    • The developed YIG microcavity optical sensor is a promising tool for sensitive magnetic field vector measurements.
    • The sensor exhibits a small footprint, simple structure, and a wide measurement range.
    • This technology has potential applications in areas requiring precise magnetic field monitoring.