We have employed Bloch-wave engineering to realize submicron diameter ultra-high quality factor GaAs/AlAs micropillars (MPs). The design features a tapered cavity in which the fundamental Bloch mode is subject to an adiabatic transition to match the Bragg mirror Bloch mode. The resulting reduced scattering loss leads to record-high visibility of the strong coupling in MPs with modest oscillator strength quantum dots. A quality factor of 13,600 and a Rabi splitting of 85 \mueV with an estimated visibility v of 0.38 are observed for a small mode volume MP with a diameter dc of 850 nm.
@article{arxiv.1107.2492,
title = {Bloch-wave engineering of quantum dot-micropillars for cavity quantum electrodynamics experiments},
author = {Matthias Lermer and Niels Gregersen and Florian Dunzer and Stephan Reitzenstein and Sven Höfling and Jesper Mørk and Lukas Worschech and Martin Kamp and Alfred Forchel},
journal= {arXiv preprint arXiv:1107.2492},
year = {2015}
}