Abstract

We report the generation of single negatively charged silicon vacancy (${\mathrm{SiV}}^{-}$) color centers by focusing a femtosecond (fs) laser on top of a high-purity diamond coated with a layer of Si nanoball. Under the interaction of a high-intensity fs laser, Si atoms were ionized and implanted into the diamond, accompanied with the creation of vacancies. After annealing at 850°C in vacuum for 1 h, the photoluminescence spectra of bright spots around the created crater presented a typical strong zero-phonon line at around 737 nm of ${\mathrm{SiV}}^{-}$ centers. Bright single ${\mathrm{SiV}}^{-}$ color centers could be observed with a maximum saturating counting rate of $300\times {10}^3\text{counts}/\mathrm{s}$. We explain the formation mechanism of ${\mathrm{SiV}}^{-}$ centers in diamond via a Coulomb explosion model. The results demonstrate that fs laser ablation can be utilized as a very promising tool to conveniently fabricate single bright ${\mathrm{SiV}}^{-}$ centers in diamond.

© 2019 Optical Society of America

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