Two-Dimensional Photonic Crystal Slab Nanocavities on Bulk Single-Crystal Diamond

TL;DR

This paper reports the fabrication of high-quality 2D photonic crystal nanocavities directly in bulk diamond, enhancing the potential for scalable quantum and classical nanophotonics applications involving diamond color centers.

Contribution

It introduces a novel fabrication method for 2D photonic crystal nanocavities in bulk diamond with high quality factors and small mode volumes, expanding nanophotonics capabilities.

Findings

Achieved high-Q nanocavities directly in bulk diamond

Demonstrated scalable planar nanophotonic platform

Enhanced photon emission control in diamond

Abstract

Color centers in diamond are promising spin qubits for quantum computing and quantum networking. In photon-mediated entanglement distribution schemes, the efficiency of the optical interface ultimately determines the scalability of such systems. Nano-scale optical cavities coupled to emitters constitute a robust spin-photon interface that can increase spontaneous emission rates and photon extraction efficiencies. In this work, we introduce the fabrication of 2D photonic crystal slab nanocavities with high quality factors and cubic wavelength mode volumes -- directly in bulk diamond. This planar platform offers scalability and considerably expands the toolkit for classical and quantum nanophotonics in diamond.