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

TL;DR

This paper introduces a calibration-free vector magnetometry method using nitrogen-vacancy centers in diamond, employing optical vortex beams for orientation determination and enabling efficient nanoscale magnetic field sensing.

Contribution

The authors develop a novel, calibration-free technique for NV center orientation detection using optical vortex beams, enhancing vector magnetometry efficiency.

Findings

Successfully determined NV center orientations without calibration.

Reconstructed magnetic field vectors with high spatial resolution.

Method improves efficiency over previous NV-based magnetometry schemes.

Abstract

We report a new method to determine the orientation of individual nitrogen-vacancy (NV) centers in a bulk diamond and use them to realize a calibration-free vector magnetometer with nanoscale resolution. Optical vortex beam is used for optical excitation and scanning the NV center in a [111]-oriented diamond. The scanning fluorescence patterns of NV center with different orientations are completely different. Thus, the orientation information on each NV center in the lattice can be known directly without any calibration process. Further, we use three differently oriented NV centers to form a magnetometer and reconstruct the complete vector information on the magnetic field based on the optically detected magnetic resonance(ODMR) technique. Compared with previous schemes to realize vector magnetometry using an NV center, our method is much more efficient and is easily applied in other NV-based quantum sensing applications.