Tuning of SiV quantum emission in nitrogen-doped nanodiamonds by dual-color excitation
A. A. Zhivopistsev, A. M. Romshin, A. V. Gritsienko, D. G. Pasternak, R. K. Bagramov, V. P. Filonenko, F. M. Maksimov, A. I. Chernov, A. M. Skomorokhov, N. I. Kargin, I. I. Vlasov
Published: 2025/9/8
Abstract
The charge dynamics of silicon-vacancy (SiV) centers have been investigated for the first time in high-pressure high-temperature nanodiamonds (NDs) with varying concentrations of substitutional nitrogen (Ns). We demonstrate a controlled sixfold enhancement of SiV- photoluminescence (PL) under dual-color excitation, consisting of strong red (~660 nm) illumination combined with weak green (~530 nm) excitation. The measured dependencies of SiV- PL lifetime and intensity on excitation wavelength, together with the enhancement dependence on Ns concentration in the studied nanodiamonds, provide unambiguous evidence of the involvement of donor nitrogen in SiV-emission dynamics. Saturation curves and second-order PL intensity correlation measurements further indicate suppression of the population of the optically inactive SiV2- state upon the addition of green excitation. These results unlock a practical pathway toward engineering optically-controlled and scalable quantum emitters based on SiV-luminescent diamond nanoparticles.