Chip-based microcavities coupled to nitrogen-vacancy centers in single crystal diamond

Optical coupling of nitrogen-vacancy centers in single-crystal diamond to an on-chip microcavity is demonstrated The microcavity is fabricated from a hybrid gallium phosphide and diamond material system and Supports whispering gallery mode resonances with spectrometer resolution limited Q > 25 000. (C) 2009 American Institute of Physics. [doi. 10.1063/1.3262948]