We have fabricated pillar microcavity samples with Bragg mirrors consisting of alternate layers of GaAs and Aluminium Oxide. Compared to the more widely studied GaAs/AlAs micropillars these mirrors can achieve higher reflectivities with fewer layer repeats and reduce the mode volume. We have studied a number of samples containing a low density of InGaAs/GaAs self assembled quantum dots in a cavity and here report observation of a three fold enhancement in the radiative lifetime of a quantum dot exciton state due to the Purcell effect.
@article{arxiv.0709.2101,
title = {Observation of the Purcell effect in high-index-contrast micropillar},
author = {A. J. Bennett and D. J. P. Ellis and A. J. Shields and P. Atkinson and I. Farrer and D. A. Ritchie},
journal= {arXiv preprint arXiv:0709.2101},
year = {2009}
}