Experimental evidence of stimulated scattering of excitons into microcavity polaritons

Huang, R.K.; Tassone, F.; Yamamoto, Yoshihisa

doi:10.1103/physrevb.61.r7854

Cited by 118 publications

(87 citation statements)

References 18 publications

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“…Finally, we have recently reported a definitive observation of stimulated scattering of polaritons in ultrafast experiments: injection of a weak probe pulse into the final state was shown to stimulate scattering from a resonantly excited pump population [10,11]. Evidence for stimulation has also been presented in a three beam experiment by Huang et al [12].…”

mentioning

confidence: 84%

Continuous Wave Observation of Massive Polariton Redistribution by Stimulated Scattering in Semiconductor Microcavities

et al. 2000

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Article:Stevenson, R.M., Astratov, V.N., Skolnick, M.S. et al. (6 more authors) (2000) Continuous wave observation of massive polariton redistribution by stimulated scattering in semiconductor microcavities. Physical Review Letters, 85 (17 ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. A massive redistribution of the polariton occupancy to two specific wave vectors, zero and ϳ3.9 3 10 4 cm 21 , is observed under conditions of continuous wave excitation of a semiconductor microcavity. The "condensation" of the polaritons to the two specific states arises from stimulated scattering at final state occupancies of order unity. The stimulation phenomena, arising due to the bosonic character of the polariton quasiparticles, occur for conditions of resonant excitation of the lower polariton branch. High energy nonresonant excitation, as in most previous work, instead leads to conventional lasing in the vertical cavity structure.

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confidence: 84%

Continuous Wave Observation of Massive Polariton Redistribution by Stimulated Scattering in Semiconductor Microcavities

et al. 2000

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“…OPA was first observed in an InGaAs/GaAs/AlGaAs microcavity [49], where a substantial signal gain of up to 70 was measured. Much experimental work has followed this first result [50,51,52,53,54,55,56,57,58,59]. Pump-probe parametric amplification of polaritons with an extraordinary gain up to 5000 and at temperatures up to 120K has been reached in GaAlAs-based microcavities and up to 220K in CdTe-based microcavities [55].…”

Section: Polariton Parametric Scattering and Optical Parametric Amplimentioning

confidence: 99%

“…Pump-probe parametric amplification of polaritons with an extraordinary gain up to 5000 and at temperatures up to 120K has been reached in GaAlAs-based microcavities and up to 220K in CdTe-based microcavities [55]. In three-beam pulsed experiments [51], polaritons scatter from two equal and opposite angles, k p and −k p , into the LP and UP states at k = 0 -note that at zero detuning, δ = 0, 2ω 0 X = ω LP (0) + ω UP (0). Interestingly, parametric amplification has been also obtained for ultracold atom pairs confined in a moving one-dimensional optical lattice [60].…”

Section: Polariton Parametric Scattering and Optical Parametric Amplimentioning

confidence: 99%

Vortices in Polariton OPO Superfluids

Marchetti

Szymańska

2012

Exciton Polaritons in Microcavities

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This chapter reviews the occurrence of quantised vortices in polariton fluids, primarily when polaritons are driven in the optical parametric oscillator (OPO) regime. We first review the OPO physics, together with both its analytical and numerical modelling, the latter being necessary for the description of finite size systems. Pattern formation is typical in systems driven away from equilibrium. Similarly, we find that uniform OPO solutions can be unstable to the spontaneous formation of quantised vortices. However, metastable vortices can only be injected externally into an otherwise stable symmetric state, and their persistence is due to the OPO superfluid properties. We discuss how the currents charactering an OPO play a crucial role in the occurrence and dynamics of both metastable and spontaneous vortices.

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“…The accumulation in the ground state of polaritons has been suggested by different experiments 1,2,3,4 and predicted theoretically by 5,6,7 . By illuminating the sample with lasers of different frequencies, it is possible to get a matter-wave amplification without requiring a coherent pumplaser 8,9 However, one of the main difficulties to obtain a Bose condensation of polaritons has been the relaxation of the bottleneck which hinders that excitons relax quickly to the optically active lower energy states. This bottleneck effect, can be relaxed if the pump-laser is increased or if different relaxation scattering mechanisms become more efficient to allow that the population relaxes to the ground state 10,11 .…”

Section: Introductionmentioning

confidence: 99%

Time resolved scattering relaxation mechanisms of microcavity polaritons

Chaves¹,

Rodríguez²

2005

Solid State Communications

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We study the polariton relaxation dynamics for different scattering mechanisms as: Phonon and electron scattering procesess. The relaxation polariton is obtained at very short times by solving the Boltzman equation. Instead of the well-known relaxation process by phonons, we show that the bottleneck effect relaxes to the ground state more efficiently at low pump power intensity when the electron relaxation process is included. In this way, we clearly demonstrate that different relaxation times exist, for which any of these two mechanism is more efficient to relax the polariton population to the ground state.

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Experimental evidence of stimulated scattering of excitons into microcavity polaritons

Cited by 118 publications

References 18 publications

Continuous Wave Observation of Massive Polariton Redistribution by Stimulated Scattering in Semiconductor Microcavities

Continuous Wave Observation of Massive Polariton Redistribution by Stimulated Scattering in Semiconductor Microcavities

Vortices in Polariton OPO Superfluids

Time resolved scattering relaxation mechanisms of microcavity polaritons

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