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

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 λ = 740 nm. Most remarkably, this improvement factor reaches 270 when the excitation wavelength is centered at 750 nm.
Authors:
; ;  [1] ; ; ; ;  [2] ;  [1] ;  [3]
  1. Department of Physics, University of Regensburg, 93040 Regensburg (Germany)
  2. CNRS-Laboratoire de Photonique et Nanostructures, Route de Nozay, 91460 Marcoussis (France)
  3. (Germany)
Publication Date:
OSTI Identifier:
22410263
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM ARSENIDES; COMPARATIVE EVALUATIONS; EFFICIENCY; EXCITATION; GALLIUM ARSENIDES; HETEROJUNCTIONS; LAYERS; PHOTOLUMINESCENCE; POLARONS; PULSED IRRADIATION; VISIBLE RADIATION; WAVELENGTHS