Calibration-Free Vector Magnetometry Using Nitrogen-Vacancy Center in Diamond Integrated with Optical Vortex Beam

Area of Science:

• Quantum sensing
• Materials science
• Nanotechnology

Background:

• Nitrogen-vacancy (NV) centers in diamond are promising quantum sensors.
• Determining NV center orientation is crucial for vector magnetometry.
• Existing methods often require complex calibration procedures.

Purpose of the Study:

• To develop a calibration-free method for determining NV center orientation in bulk diamond.
• To realize a nanoscale-resolution vector magnetometer using NV centers.
• To improve the efficiency and applicability of NV-based quantum sensing.

Main Methods:

• Utilizing optical vortex beams for excitation and scanning of NV centers in [111]-oriented diamond.
• Analyzing distinct scanning fluorescence patterns to identify individual NV center orientations.
• Employing three differently oriented NV centers and optically detected magnetic resonance (ODMR) for vector magnetic field reconstruction.

Main Results:

• Successfully determined the orientation of individual NV centers without calibration.
• Demonstrated a calibration-free vector magnetometer with nanoscale resolution.
• Achieved efficient vector magnetic field reconstruction using the ODMR technique.

Conclusions:

• The developed method provides direct orientation information of NV centers, eliminating calibration needs.
• This approach enables efficient and broadly applicable nanoscale vector magnetometry.
• The technique holds potential for advancing various NV-based quantum sensing applications.