Multi-resonant open-access micro-cavity arrays for light matter interaction

TL;DR

This paper presents a high-finesse open-access micro-cavity array designed for enhanced light-matter interactions, featuring novel fabrication techniques and independent tuning capabilities for multiple cavities in a compact setup.

Contribution

The authors develop a new fabrication method for high-finesse open-access cavity arrays with independent tuning, advancing scalable quantum interfaces.

Findings

Cavities exhibit optical properties comparable to state-of-the-art fibre-tip cavities.

Demonstrated a 2x2 cavity array with independent frequency tuning.

Fabrication techniques enable scalable and tunable light-matter interfaces.

Abstract

We report the realisation of a high-finesse open-access cavity array, tailored towards the creation of multiple coherent light-matter interfaces within a compact environment. We describe the key technical developments put in place to fabricate such a system, comprising the creation of tapered pyramidal substrates and an in-house laser machining setup. Cavities made from these mirrors are characterised, by laser spectroscopy, to possess similar optical properties to state-of-the-art fibre-tip cavities, but offer a compelling route towards improved performance, even when used to support only a single mode. The implementation of a 2 by 2 cavity array and the independent frequency tuning between at least three neighbouring sites are demonstrated.