Pronounced Purcell enhancement of spontaneous emission in CdTe/ZnTe quantum dots embedded in micropillar cavities

TL;DR

This study demonstrates a significant Purcell enhancement of spontaneous emission in CdTe/ZnTe quantum dots embedded in micropillar cavities, confirming theoretical predictions and improving emission efficiency.

Contribution

It provides experimental evidence of Purcell enhancement in CdTe/ZnTe quantum dots within micropillar cavities, with detailed analysis of spectral properties and emission enhancement factors.

Findings

Purcell factor of 5.7 observed experimentally

Pronounced cavity eigenmodes in emission spectra

Good agreement between experimental data and simulations

Abstract

The coupling of CdTe/ZnTe quantum dot (QD) emission to micropillar cavity eigenmodes in the weak coupling regime is demonstrated. We analyze photoluminescence spectra of QDs embedded in monolithic micropillar cavities based on Bragg mirrors which contain MgSe/ZnTe/MgTe superlattices as low-index material. The pillar emission shows pronounced cavity eigenmodes and their spectral shape is in good agreement with simulations. QD emission in resonance with the cavity mode is shown to be efficiently guided toward the detector and an experimental Purcell enhancement by a factor of 5.7 is determined, confirming theoretical expectations.