School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia.
Opt Lett. 2011 Nov 1;36(21):4224-6. doi: 10.1364/OL.36.004224.
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.
我们首次解决了纳米金刚石中与 Cr 相关的中心的非辐射衰减率的测量问题。与我们之前在体金刚石中创建的 Cr 中心的量子效率测量相比，由于尺寸依赖性效应，在生长的纳米金刚石中单独测量辐射和非辐射衰减率更具挑战性。在本信中，我们证明了通过使用离焦偶极子成像和通过有限差分时域 (FDTD) 进行收集效率计算，可以推断出与 Cr 相关的中心的量子效率高达 0.9，这些中心表现出 2 能级系统光子统计特性。
