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High-sensitivity vector magnetic field sensor based on a V-shaped multimode-no-core-multimode fiber structure.

Yu Ji, Shengli Pu, Weinan Liu

    Optics Letters
    |May 15, 2024
    PubMed
    Summary
    This summary is machine-generated.

    A novel bent optical fiber sensor using surface plasmon resonance detects vector magnetic fields. This simple, low-cost device offers high sensitivity for magnetic field intensity and direction.

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    Area of Science:

    • Photonics and optical sensing
    • Materials science for sensor applications
    • Magnetometry

    Background:

    • Optical fiber sensors offer advantages in harsh environments.
    • Surface Plasmon Resonance (SPR) is a sensitive detection technique.
    • Vector magnetic field sensing requires specialized sensor designs.

    Purpose of the Study:

    • To propose and investigate a bent multimode-no-core-multimode optical fiber structure for vector magnetic field sensing.
    • To leverage the surface plasmon resonance effect for enhanced sensitivity.
    • To evaluate the sensor's performance in terms of magnetic field intensity and direction sensitivity.

    Main Methods:

    • Fabrication of a bent no-core fiber (NCF) coated with a gold film.
    • Excitation of Surface Plasmon Resonance (SPR) using the evanescent field of the NCF.
    • Utilizing magnetic fluid as the magneto-sensitive material for magnetic field detection.

    Main Results:

    • The sensor demonstrated high sensitivity to refractive index changes (5630 nm/RIU).
    • Achieved high sensitivity for magnetic field intensity (5.74 nm/mT).
    • Exhibited high sensitivity for magnetic field direction (0.22 nm/°).

    Conclusions:

    • The proposed bent NCF SPR sensor is effective for vector magnetic field sensing.
    • The sensor offers a simple structure, low cost, point sensing, and excellent mechanical properties.
    • This technology holds promise for various magnetic field monitoring applications.