Microcavity design for low threshold polariton condensation with ultrashort optical pulse excitation
Abstract
We present a microcavity structure with a shifted photonic stop-band to enable efficient non-resonant injection of a polariton condensate with spectrally broad femtosecond pulses. The concept is demonstrated theoretically and confirmed experimentally for a planar GaAs/AlGaAs multilayer heterostructure pumped with ultrashort near-infrared pulses while photoluminescence is collected to monitor the optically injected polariton density. As the excitation wavelength is scanned, a regime of polariton condensation can be reached in our structure at a consistently lower fluence threshold than in a state-of-the-art conventional microcavity. Our microcavity design improves the polariton injection efficiency by a factor of 4, as compared to a conventional microcavity design, when broad excitation pulses are centered at a wavelength of 740 nm. Most remarkably, this improvement factor reaches 270 when the excitation wavelength is centered at 750 nm.
Keywords
Cite
@article{arxiv.1605.04891,
title = {Microcavity design for low threshold polariton condensation with ultrashort optical pulse excitation},
author = {C. Poellmann and U. Leierseder and E. Galopin and A. Lemaître and A. Amo and J. Bloch and R. Huber and J. -M. Ménard},
journal= {arXiv preprint arXiv:1605.04891},
year = {2016}
}