Photo-ionization of the nitrogen-vacancy center in diamond

Determining the internal quantum efficiency of shallow-implanted nitrogen-vacancy defects in bulk diamond

“…The additional contribution can indeed be explained by taking into account an intensity dependent transition to another level, presumably a photo-induced ionization process of negatively charged NV defects [31,32]. Transitions to the neutral-charge state NV 0 at a rate Γ ion provide an additional decay channel for the excited state 3 E of the NV − defect, effectively decreasing its lifetime [ Fig.…”

Nitrogen-vacancy center in diamond: Model of the electronic structure and associated dynamics

“…The HuangRys factor is 3.7 with only 2.7 percent of the transition strength being associated with the zero-phonon transition [35]. At high excitation densities there can be photoionization of the N-V center of interest and the creation of the neutrally charged [N-V] 0 center [36,37]. This center has a zero-phonon line at 575 nm with a vibronic band to lower energy [38].…”

Diamond nitrogen-vacancy centers created by scanning focused helium ion beam and annealing

“…At these powers, we observe a dependence of the dynamic NV center photochromic behavior on helium ion dose. 31,32 Finally, to investigate the spin properties, we measured continuous-wave optically detected magnetic resonance (cw-ODMR) spectra for S2 at room temperature. In the experiment, the microwave and optical excitations were at constant powers, and the fluorescence intensity into the phonon sidebands was measured as a function of microwave frequency.…”