Microcavity design for low threshold polariton condensation with ultrashort optical pulse excitation
- Department of Physics, University of Regensburg, 93040 Regensburg (Germany)
- CNRS-Laboratoire de Photonique et Nanostructures, Route de Nozay, 91460 Marcoussis (France)
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.
- OSTI ID:
- 22410263
- Journal Information:
- Journal of Applied Physics, Vol. 117, Issue 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Magneto-exciton-polariton condensation in a sub-wavelength high contrast grating based vertical microcavity
Microcavity-like exciton-polaritons can be the primary photoexcitation in bare organic semiconductors