Triangular cross-section grating couplers for integrated quantum nanophotonic hardware in silicon carbide

2024/10/16 by Saha, Pranta, Rubin, Alex H., Majety, Sridhar +2
#FOS: Physical sciences #Optics (physics.optics)

paper · doi:10.48550/arxiv.2410.12150

Abstract

We design, fabricate, and characterize fishbone grating couplers for triangular cross-section photonics in silicon carbide compatible with color center integration. The periodic and aperiodic grating coupler designs are optimized to outcouple up to 31% of light in the fundamental TE mode of a triangular waveguide. The devices are fabricated using an ion beam etching process in a 4H-SiC sample implanted with NV center ensembles. The room-temperature transmission and the cryogenic NV center photoluminescence collection measurements indicate experimental grating coupler efficiency of up to 24%. This result provides a scalable method to efficiently extract color center light from SiC quantum nanophotonic devices to free-space optics.

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