Scanning cavity microscopy of a single-crystal diamond membrane

Abstract

Spin-bearing color centers in the solid state are promising candidates for the realization of quantum networks and distributed quantum computing. A remaining key challenge is their efficient and reliable interfacing to photons. Incorporating minimally processed membranes into open-access microcavities represents a promising route for Purcellenhanced spin-photon interfaces: it enables significant emission enhancement and efficient photon collection, minimizes deteriorating influence on the quantum emitter, and allows for full spatial and spectral tunability, key for controllably addressing suitable emitters with desired optical and spin properties. Here, we study the properties of a high-finesse fiber Fabry-Pérot microcavity with integrated single-crystal diamond membranes by scanning cavity microscopy. We observe spatially resolved the effects of the diamond-air interface on the cavity mode structure: a strong correlation of the cavity finesse and mode structure with the diamond thickness and surface topography, significant transverse-mode mixing under diamond-like conditions, and mode-character-dependent polarization-mode splitting. Our results reveal the influence of the diamond surface on the achievable Purcell enhancement, which helps to clarify the route towards optimized spin-photon interfaces.

References in corpus (6)

• Coherent spin control of a nanocavity-enhanced qubit in diamond
• Cavity quantum electrodynamics with color centers in diamond
• Cavity-enhanced single photon source based on the silicon vacancy center in diamond
• Optically coherent nitrogen-vacancy centers in μm-thin etched diamond membranes
• Frequency splitting of polarization eigenmodes in microscopic Fabry-Perot cavities
• Optically coherent nitrogen-vacancy defect centers in diamond nanostructures

Cited by in corpus (5)

• Coherent Coupling of a Diamond Tin-Vacancy Center to a Tunable Open Microcavity
• Spectral stability of V2 centres in sub-micron 4H-SiC membranes
• Cavity enhancement of V2 centers in 4H-SiC with a fiber-based Fabry-Pérot microcavity
• Homogeneous Free-Standing Nanostructures from Bulk Diamond over Millimeter Scales for Quantum Technologies
• Laser-cut Patterned, Micrometer-thin Diamond Membranes with Coherent Color Centers for Open Microcavities