All-Optical Photoluminescence Response of Nitrogen-Vacancy Ensembles in Diamond at Low Magnetic Fields

Abstract

All-optical (AO), microwave-free magnetometry using nitrogen-vacancy (NV) centers in diamond is attractive due to its broad sample compatibility and reduced experimental complexity. In this work, we investigate room-temperature AO photoluminescence (PL) at low magnetic fields (<2 mT) using diamonds with NV ensembles at ppm concentrations. Measured AO-PL contrast features as a function of applied magnetic field magnitude and direction are correlated with near-degenerate NV electronic spin and hyperfine transitions from different NV orientations within the diamond host. Reasonable agreement is found between low-field AO-PL measurements and model-based simulations of the effects of resonant dipolar interactions between NV centers. Maximum observed AO-PL contrast depends on both NV concentration and laser illumination intensity at 532 nm. These results imply different optimal conditions for low-field AO NV sensing compared to conventional optically detected magnetic resonance (ODMR) techniques, suggesting new research and application opportunities using AO measurements with lower system complexity, size, weight, and power.

23 pages, 19 figures

References in corpus (9)

• High-sensitivity diamond magnetometer with nanoscale resolution
• Coherent control of single spins in silicon carbide at room temperature
• Spin dynamics in the optical cycle of single nitrogen-vacancy centres in diamond
• Room Temperature Coherent Control of Spin Defects in hexagonal Boron Nitride
• Depolarization dynamics in a strongly interacting solid-state spin ensemble
• Magnetic Field Fingerprinting of Integrated Circuit Activity with a Quantum Diamond Microscope
• Impact of Charge Conversion on NV-Center Relaxometry
• Fourier optical processing enables new capabilities in diamond magnetic imaging
• Near-zero-field microwave-free magnetometry with nitrogen-vacancy centers in nanodiamonds