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.
@article{arxiv.1409.3068,
title = {Three megahertz photon collection rate from an NV center with millisecond spin coherence},
author = {Luozhou Li and Edward H. Chen and Jiabao Zheng and Sara L. Mouradian and Florian Dolde and Tim Schröder and Sinan Karaveli and Matthew L. Markham and Daniel J. Twitchen and Dirk Englund},
journal= {arXiv preprint arXiv:1409.3068},
year = {2015}
}