A new “bullseye”-shaped grating has allowed researchers to efficiently collect photons with specific spins from the diamond nitrogen-vacancy (NV) colour centre. The number of photons collected reached nearly three million per second, which is the highest ever value reported to date for a single NV. The result could have important implications for a number of technologies, including nanoscale sensors, single photon sources, and quantum memories for quantum computing and networking……
http://nanotechweb.org/cws/article/tech/60511
Diamond bullseye gratings