Condensed Matter > Mesoscale and Nanoscale Physics
[Submitted on 16 May 2016]
Title:Microcavity design for low threshold polariton condensation with ultrashort optical pulse excitation
View PDFAbstract: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.
Submission history
From: Christoph Pöllmann [view email][v1] Mon, 16 May 2016 19:56:07 UTC (1,087 KB)
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