Cavity-enhanced radiative emission rate in a single-photon-emitting diode operating at 0.5 GHz

TL;DR

This paper demonstrates a single-photon-emitting diode with cavity-enhanced emission, achieving high repetition rates up to 0.5 GHz through innovative lateral confinement and microcavity design.

Contribution

It introduces a novel microcavity structure with lateral confinement that enhances radiative emission rates in a single-photon diode at gigahertz frequencies.

Findings

Observed Purcell enhancement in electroluminescence decay rate

Achieved single-photon electroluminescence at 0.5 GHz

Implemented a low-refractive-index aluminium oxide annulus for mode confinement

Abstract

We report the observation of a Purcell enhancement in the electroluminescence decay rate of a single quantum dot, embedded in a microcavity light-emitting-diode structure. Lateral confinement of the optical mode was achieved using an annulus of low-refractive-index aluminium oxide, formed by wet oxidation. The same layer acts as a current aperture, reducing the active area of the device without impeding the electrical properties of the p-i-n diode. This allowed single photon electroluminescence to be demonstrated at repetition rates up to 0.5 GHz.