Fiber-optic magnetic-field imaging

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.