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Optik

Probing the electronic ground state of the nitrogen-vacancy center in nanodiamonds at room temperature

Rahul Dhankhar, Nitesh Singh, Rajesh V. Nair

Published Sep 8, 2024• 8 citations
Publisher
DOI
10.1016/j.ijleo.2024.172038

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We report the first observation, to the best of our knowledge, of electron spin transients in single negatively charged nitrogen-vacancy (NV−) centers, contained within optically trapped nanodiamonds, in both atmospheric pressure and low vacuum. It is shown that, after an initial exposure to low vacuum, the trapped nanodiamonds remain at temperatures near room temperature even in low vacuum. Furthermore, the transverse coherence time of the NV− center spin, measured to be T2=101.4 ns, is robust over the range of trapping powers considered in this study.
Nitrogen-vacancy centers in diamond allow for coherent spin-state manipulation at room temperature, which could bring dramatic advances to nanoscale sensing and quantum information technology. We introduce a method for the optical measurement of the spin contrast in dense nitrogen-vacancy (NV) ensembles. This method brings insight into the interplay between the spin contrast and fluorescence lifetime. We show that for improving the spin readout sensitivity in NV ensembles, one should aim at modifying the far-field radiation pattern rather than enhancing the emission rate.