Single crystal diamond has become an attractive material for quantum information processing [1] due to the extraordinary properties of optically active defect centers, including Silicon (SiV), Nickel and Nitrogen (NV) complexes. The NV-center is the most investigated color center due to its outstanding properties such as very long spin lifetimes at room temperature and its suitability for single photon sources. There have been a number of recent proposals for the employment of color centers as cavity enhanced single photon sources, for cavity enhanced spin measurements or as optical qubits in quantum networks. All these proposals require a direct coupling of an emitter to a cavity with long photon lifetime (high quality factor Q) as well as strong spatial light confinement (small modal volume V). Photonic crystal microcavities etched in a diamond slab are being considered as an attractive architecture to manipulate and control light-matter interaction between an individual defect center and a resonator.
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