Weak Magnetic Field Effects on the Photoluminescence of an Ensemble of NV Centers in Diamond: Experiment and Modelling

Spin-Relaxation of Dipolar-Coupled Nitrogen-Vacancy Centers : The role of Double-flip Processes

“…Previous studies [1,3] reported the presence of a photoluminescence dip in zero magnetic field which was heavily dependent on the laser polarization angle with respect to the diamond axes and the magnetic field.…”

“…These mechanisms limit the efficiency of typical microwave based NV magnetometers, but quantum control techniques can be combined to surpass this interaction limit [37]. Further, CR mechanisms can be turned as a tool for magnetic field sensing [3,4]. Spectral features in the photoluminescence (PL) indeed appear when the magnetic field crosses specific crystal planes where dipolar interactions are enhanced, leading to CR.…”

“…Spectral features in the photoluminescence (PL) indeed appear when the magnetic field crosses specific crystal planes where dipolar interactions are enhanced, leading to CR. The projected sensitivity of such magnetometers lie in the tens of pT/ √ Hz [3], on a par with the most sensitive microwave based NV magnetometers [28,34].…”

“…Our observations have important implications for magnetometry with NV ensembles. DC microwave-free magnetometry has already been performed using either NV-NV cross-relaxations [3,4] or level anti-crossing [33,35,36]. Here we propose a similar protocol but using the spin depolarization at zero-field.…”

Compact All‐Optical Quantum Sensor Device Based on Nitrogen Vacancy Centers in Diamond

“…Compared with other contributions, [13,[16][17][18] we focus on a microwave-free approach that was already discussed in the literature. [11,12,[19][20][21][22] Advantages of the microwave-free sensor approach are manifold: without an intrinsic microwave source, no influence to the measurement environment is exerted and hence usable for zero-field measurements. Also, the setup is less complex; thus, simplifications in the packaging process lead to cost reduction.…”