Ultra-high-Q nanobeam cavity design in Diamond

Abstract

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 (λ/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.

6 pages, 4 figures

References in corpus (4)

• High Quality factor photonic crystal nanobeam cavities
• Fabrication and Characterization of Two-Dimensional Photonic Crystal Microcavities in Nanocrystalline Diamond
• Ultra high-Q photonic crystal nanocavity design: The effect of a low-epsilon slab material
• Design of an ultrahigh Quality factor silicon nitride photonic crystal nanocavity for coupling to diamond nanocrystals