Efficient collection of the broadband fluorescence of the diamond nitrogen vacancy center is essential for a range of applications in sensing, on-demand single photon generation, and quantum information processing. Here, we introduce a circular `bullseye' diamond grating enabling a collected photon rate of (3.0±0.1)×10⁶ counts per second from a single nitrogen-vacancy center with a spin coherence time of 1.7±0.1 ms. Back-focal-plane studies indicate efficient redistribution into low-NA modes.
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Li et al. (2014) studied this question.