Dinosaur Photonic Crystal Cavity Interfaces for Color Center Coupling to Triangular Nanostructures

TL;DR

This paper introduces a novel 'Dinosaur' photonic crystal cavity design with a tapered interface, enabling efficient coupling of embedded color centers to waveguides in quantum photonic devices, with fewer fabrication steps.

Contribution

The paper presents a new corrugated triangular cavity design and an optimized tapered interface for improved mode conversion and light-matter interaction in quantum photonics.

Findings

Reduced photon losses through cavity-waveguide interface optimization.

Precise tuning of light-matter interaction via interface adjustment.

Simplified fabrication process compared to traditional nanostructures.

Abstract

Waveguide-coupled photonic crystal cavities with a triangular cross section fabricated by angled etching are suitable to interface embedded color centers with flying photonic qubits in quantum information applications. Moreover, their fabrication requires fewer processing steps compared to nanostructures produced by quasi-isotropic undercutting. As an alternative to established hole-based photonic crystal cavities, we introduce corrugated triangular 'Dinosaur' photonic crystal cavities, and develop a tapered, quasi loss-free cavity-waveguide interface to adiabatically interconvert Bloch and waveguide modes. We optimize the cavity-waveguide interface to minimize photon losses and demonstrate that its adjustment allows precise tuning of the light-matter interaction.