Coupling an epitaxial quantum dot to a fiber-based external-mirror microcavity

TL;DR

This paper demonstrates the successful coupling of individual InAs quantum dots to a fiber-based external-mirror microcavity, achieving high collection efficiency and tunability, with potential for entering the strong coupling regime.

Contribution

It introduces a novel fiber-bonded external-mirror microcavity system for quantum dot coupling, enabling rapid tuning without linewidth degradation.

Findings

High collection efficiency into fiber achieved

Cavity tunability with piezoelectric actuator demonstrated

Potential to reach strong coupling regime identified

Abstract

We report the coupling of individual InAs quantum dots (QDs) to an external-mirror microcavity. The external mirror is bonded to a fiber and positioned above a semiconductor sample consisting of a QD-containing GaAs layer on top of a distributed Bragg reflector (DBR). This open cavity can be rapidly tuned with a piezoelectric actuator without negatively affecting the QD linewidth. A mirror radius of curvature of 42 microns and a cavity length of 10 microns enable good mode-matching and thus high collection efficiency directly into the fiber. With an improved finesse this system may enter the strong coupling regime.