Microcavity design for low threshold polariton condensation with ultrashort 
optical pulse excitation

Poellmann, C.; Leierseder, U.; Galopin, E.; Lemaitre, A.; Amo, A.; Bloch, J.; Huber, R.; Menard, J. -M.

doi:10.1063/1.4921586

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Microcavity design for low threshold polariton condensation with ultrashort optical pulse excitation

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Menard, J. -M.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Poellmann, C., Leierseder, U., Galopin, E., Lemaitre, A., Amo, A., Bloch, J., et al. (2015). Microcavity design for low threshold polariton condensation with ultrashort optical pulse excitation. JOURNAL OF APPLIED PHYSICS, 117(20): 205702. doi:10.1063/1.4921586.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-63C2-8

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 lambda = 740 nm. Most remarkably, this improvement factor reaches 270 when the excitation wavelength is centered at 750 nm. (c) 2015 AIP Publishing LLC.