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Fiber-optic magnetic-field imaging.

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    We developed a scanning fiber-optic probe for high-speed, high-sensitivity magnetic-field imaging using nitrogen-vacancy (NV) centers. This novel probe enables detailed 2D magnetic field mapping with advanced optical and microwave control.

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    Area of Science:

    • Quantum sensing
    • Nanophotonics
    • Magnetometry

    Background:

    • Nitrogen-vacancy (NV) centers in diamond are sensitive quantum sensors.
    • Optical fiber probes offer remote sensing capabilities.
    • Accurate magnetic field imaging is crucial for various scientific and technological applications.

    Purpose of the Study:

    • To demonstrate a novel scanning fiber-optic probe for magnetic-field imaging.
    • To achieve high-speed and high-sensitivity 2D magnetic field mapping.
    • To integrate NV center manipulation and readout within a single fiber probe.

    Main Methods:

    • Coupling NV centers in a diamond microcrystal to an optical fiber.
    • Integrating a two-wire microwave transmission line with the fiber probe.
    • Utilizing laser initialization and microwave manipulation of NV electron spins.
    • Employing photoluminescence spin-readout via the optical fiber for imaging.

    Main Results:

    • Successful demonstration of a scanning fiber-optic probe for magnetic-field imaging.
    • Achieved high-speed and high-sensitivity 2D magnetic field profile imaging.
    • Validated the integrated approach for NV center manipulation and readout.

    Conclusions:

    • The developed fiber-optic probe represents a significant advancement in magnetic-field imaging technology.
    • This technique offers a versatile platform for nanoscale magnetic field measurements.
    • The integrated design enhances the efficiency and applicability of NV center-based magnetometry.