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Compact magnetic field sensor based on plasmonic fiber-tip.

Yin Liu, Qiming Liao, Zhipeng Wang

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    |November 23, 2021
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    Summary
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    This study introduces a compact magnetic field fiber-optic sensor using a plasmonic fiber-tip and magnetic fluid. This innovative sensor achieves high sensitivity and linear response for magnetic field detection.

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    Area of Science:

    • Optoelectronics
    • Nanotechnology
    • Fiber Optics

    Background:

    • Traditional fiber-optic sensors often have large sensing sizes due to side-wall functionalization.
    • Localized surface plasmon resonance (LSPR) on metallic metasurfaces offers sub-wavelength light manipulation.
    • Magnetic fluids are sensitive to external magnetic fields.

    Purpose of the Study:

    • To develop a compact and highly sensitive magnetic field fiber-optic sensor.
    • To leverage plasmonic fiber-tip technology and magnetic fluids for enhanced sensing capabilities.
    • To demonstrate the feasibility of pseudo-vector magnetic field sensing.

    Main Methods:

    • Fabrication of a plasmonic fiber-tip sensor utilizing a metallic metasurface on a multimode fiber (MMF).
    • Integration of magnetic fluid with the plasmonic fiber-tip.
    • Experimental characterization of the sensor's response to varying magnetic field strengths.

    Main Results:

    • The developed sensor exhibits a linear response to magnetic fields in the range of 0-20 mT.
    • Achieved high magnetic field sensitivity of 0.532 nm/mT.
    • Demonstrated the potential for pseudo-vector magnetic field sensing.

    Conclusions:

    • The plasmonic fiber-tip sensor combined with magnetic fluid offers a compact and effective solution for magnetic field sensing.
    • The proposed sensor overcomes the size limitations of conventional methods.
    • The technology shows promise for advanced magnetic field measurement applications, including pseudo-vector detection.