Optically Detected Magnetic Resonance of Nitrogen-Vacancy Centers in Diamond under Weak Laser Excitation
Physical Review Applied(2023)
摘要
As promising quantum sensors, nitrogen-vacancy (NV) centers in diamond have
been widely used in frontier studies in condensed matter physics, material
sciences, and life sciences. In practical applications, weak laser excitation
is favorable as it reduces the side effects of laser irradiation, for example,
phototoxicity and heating. Here we report a combined theoretical and
experimental study of optically detected magnetic resonance (ODMR) of NV-center
ensembles under weak 532-nm laser excitation. In this regime, both the width
and splitting of ODMR spectra decrease with increasing laser power. This power
dependence is reproduced with a model considering laser-induced charge
neutralization of NV–N+ pairs, which alters the local electric field
environment. These results are important for understanding and designing
NV-based quantum sensing in light-sensitive applications.
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