[13p-N321-1~15] 3.11 フォトニック構造・現象

▲ [13p-N321-2] Design of a diamond photonic crystal cavity integrated on a SiN waveguide

〇(M2)Yeting Yang^1,2、Feng Tian¹、Satoshi Iwamoto^1,2 (1.RCAST、2.IIS)

キーワード：Photonic crystal, Nanocavities, Nitrogen vacancy centers

Diamond with nitrogen–vacancy (NV) centers is one of the most promising platforms realizing high-performance solid-state quantum repeaters. Towards the realization of large-scale quantum information processing systems, it is necessary to coherently connect individual NV centers spatially separated through low-loss optical waveguides. It is numerically demonstrated that a simple hybrid structure locating a diamond nanobeam waveguide on an air-suspended SiN waveguide can realize almost loss-less light coupling between two waveguides. Here, we report a design of diamond PhC cavity in such a hybrid structure. Our numerical simulations show that a Purcell factor (F_P) over 90 is attainable in the hybrid structure despite the small refractive index contrast between diamond (n = 2.4) and SiN (n = 2.01), indicating that the efficiency of zero-phonon-line (ZPL) emission of NV centers can be enhanced even in such hybrid structures.