PT Unknown AU Kuzin, A Elmanov, I Kovalyuk, V An, P Goltsman, G TI Silicon nitride focusing grating coupler for input and output light of NV-centers SE Proc. 32-nd EMSS PY 2020 BP 349 EP 353 DI 10.46354/i3m.2020.emss.051 DE NV-centers; focusing grating coupler AB Here we presented the numerical results for the calculation of focusing grating coupler efficiency in the visible wavelength range. Using the finite element method, the optimal geometric parameters, including filling factor and grating period for a central wavelength of 637 nm, were found. Obtained results allow to input/output single-photon radiation from NV-centers, and can be used for research and development of a scalable on-chip quantum optical computing. ER