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The Japan Society of Applied Physics

Spectral control of nano-diamond by dressed photon - phonon etching

R. Nagumo

Published Feb 6, 2015• 0 citations
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Spectral diffusion is the phenomenon of random jumps in the emission wavelength of narrow lines. This phenomenon is a major hurdle for applications of solid state quantum emitters like quantum dots, molecules, or diamond defect centers in an integrated quantum optical technology. Here, we provide further insight into the underlying processes of spectral diffusion of the zero-phonon line of single nitrogen vacancy centers in nano-size diamond by using a novel method based on photon correlation interferometry. The method works although the spectral diffusion rate is several orders of magnitude higher than the photon detection rate and thereby improves the time resolution of previous experiments with nano-size diamond by 6 orders of magnitude. We study the dependency of the spectral diffusion rate on the excitation power, temperature, and excitation wavelength under off-resonant excitation. Our results bring insight into the mechanism of spectral diffusion and suggest a strategy to increase the number of spectrally indistinguishable photons emitted by diamond nanocrystals.
Defect centers in diamond are regarded as a promising candidate for future solid state quantum technology. In particular the nitrogen vacancy (NV) center attracts researchers attention, as it promises to emit indistinguishable single photons and provides a triplet ground state with ultra long spin coherence times. In particular NV centers in nano diamonds are attractive, since they can be integrated into quantum photonic hybrid devices with nano manipulation techniques. We report on first demonstrations of the integration of NV-centers into photonic hybrid devices, and point out future applications. Beside the striking demonstrations of the integrability, nanodiamonds have several drawbacks. In particular the spectral diffusion of the zero-phonon line is addressed.