Ultra-high-Q nanobeam cavity design in Diamond

Details Ultra-high-Q nanobeam cavity design in Diamond Ultra-high-Q nanobeam cavity design in Diamond

2010-12-25

arxiv.org/abs/1012.5481v1

Physics

Optics

6 pages, 4 figures

Scientific paper

A novel nanobeam design with a triangular cross-section is proposed. This design makes possible implementing nanocavities with improved optical properties. The dependence of a diamond-based cavity quality factor Q and mode volume Vm on geometry parameter space are studied via 3D FDTD computations. An ultra-high-Q cavity with Q\aprox 2.51 \times 10^6 and Vm=1.06 \times ({\lambda}/n)^3 is predicted. The mode preferential radiation is upward. The implications on the potential applications are discussed. The proposed nanobeam enables fabrication of the cavity without relying on a pre-existing free-standing diamond membrane as required in most previous approaches.

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