Recharging Dynamics of Single Nitrogen-Vacancy Centers in Ultrapure Diamond

摘要

Photoluminescence excitation spectra of individual nitrogen-vacancy (NV) centers in diamond are investigated. Recharging dynamics between the neutral (NV0) and negatively charged (NV-) states are elucidated and the optimal excitation wavelength for NV- is found. A sharp resonance at an excitation wavelength of 521 nm facilitates an efficient conversion to NV~0.