We address for the first time the measurement of nonradiative decay rates in Cr-related centers in nanodiamonds. Compared to our previous quantum efficiency measurement of Cr centers created in bulk diamond, separate measurements of radiative and nonradiative decay rates in grown nanodiamonds prove more challenging due to size dependence effects. We demonstrate in this Letter that, using defocused dipole imaging and collection efficiency calculation via finite-difference time-domain (FDTD), a quantum efficiency up to 0.9 can be inferred to Cr-related centers showing a 2-level system photon statistics.
© 2011 Optical Society of America
Original Manuscript: August 18, 2011
Revised Manuscript: September 9, 2011
Manuscript Accepted: September 9, 2011
Published: October 26, 2011
Vol. 7, Iss. 1 Virtual Journal for Biomedical Optics
S. Castelletto and A. Boretti, "Radiative and nonradiative decay rates in chromium-related centers in nanodiamonds," Opt. Lett. 36, 4224-4226 (2011)