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Highly sensitive Mach-Zehnder interferometric micromagnetic field sensor based on 3D printing technology.

Dengwei Zhang, Zhihang Zhang, Heming Wei

    Applied Optics
    |October 6, 2021
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    Summary

    A novel polymer magnetic sensing device uses a Mach-Zehnder interferometer and magnetic fluids to detect magnetic fields. This magneto-optical sensor achieves high sensitivity and a minimal detectable magnetic field resolution of 59.7 nT.

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    Area of Science:

    • Photonics and Optical Sensing
    • Materials Science
    • Magnetometry

    Background:

    • Magnetic field sensing is crucial for various applications.
    • Existing sensors often face limitations in sensitivity, stability, or miniaturization.

    Purpose of the Study:

    • To propose and demonstrate a novel two-photon 3D printed polymer magnetic sensing device.
    • To utilize a Mach-Zehnder interferometer integrated with magnetic fluids for enhanced magnetic field detection.

    Main Methods:

    • Fabrication of a Mach-Zehnder interferometer (MZI) structure using two-photon 3D printing.
    • Integration of magnetic fluids (MFs) into a hollow cavity within one MZI arm to create a magneto-optical component.
    • Characterization of the device's response to varying magnetic fields by analyzing interferometric spectra.

    Main Results:

    • The fabricated MZI device with a 40 µm hollow length demonstrated high sensitivity to magnetic fields.
    • The magnetic field sensitivity was measured to be -1.675 nm/Oe.
    • A minimal detectable magnetic field resolution of 59.7 nT was achieved with good stability, using a spectrometer with 1 pm resolution.

    Conclusions:

    • The proposed 3D printed polymer MZI device effectively senses magnetic fields through magneto-optical effects.
    • The device exhibits high sensitivity and excellent resolution, making it suitable for advanced magnetic field detection applications.
    • This work highlights the potential of integrated magneto-optical components in polymer-based photonic devices.