Abstract:
The nitrogen-vacancy (NV) center is one of the most prominent candidates for quantum
technologies, and its efficient utilization requires control over its spontaneous emission rate.
Here, we report the wavelength-selective enhancement and suppression of NV center emission
lifetime at room temperature by modifying the local density of optical states (LDOS) around
them. The results are explained using the Barnett–Loudon sum rule and also supported by the
LDOS calculations. Two complementary measurement geometries are employed to study the
direction-dependent emission behavior from the nanodiamonds decorated on the top of photonic
crystals. The lifetime distributions are compared with a proper reference sample using the
Kolmogorov–Smirnov test to verify the distinct nature of lifetime distributions. The
wavelength-selective enhancement or suppression of emission rates would be useful for NV
center-based high-resolution imaging and effective readout of its charge states.
