Design and characterization of high optical quality InGaAs/GaAs/AlGaAs-based polariton microcavities

Exciton-polaritons in semiconductor microcavities form a highly nonlinear platform to study a variety of effects interfacing optical, condensed matter, quantum and statistical physics. We show that the complex polariton patterns generated by picosecond pulses in microcavity wire waveguides can be understood as the Cherenkov radiation emitted by bright polariton solitons, which is enabled by the unique microcavity polariton dispersion, which has momentum intervals with positive and negative group velocities. Unlike in optical fibres and semiconductor waveguides, we observe that the microcavity wire Cherenkov radiation is predominantly emitted with negative group velocity and therefore propagates backwards relative to the propagation direction of the emitting soliton. We have developed a theory of the microcavity wire polariton solitons and of their Cherenkov radiation and conducted a series of experiments, where we have measured polariton-soliton pulse compression, pulse breaking and emission of the backward Cherenkov radiation.

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“…The microcavity was previously described in ref. 51 . The detuning between the exciton and the photon modes is ≃− 2 meV.…”

Section: Resultsmentioning

confidence: 99%

Backward Cherenkov radiation emitted by polariton solitons in a microcavity wire

et al. 2017

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“…This comes with some difficulties such as the strain in the quantum wells, which may eventually be transferred into strain in the mirrors [37], but comes also with the great advantage that the experiments can be realized in transmission mode, which allows obtaining a much higher signal to noise ratio thanks to the suppression of the back-reflected light from the excitation laser. Let us note here that, in InGaAs-based cavities, spontaneous condensation is very difficult to observe also because of the coupling between the different quantum wells due to their very shallow depth [38].…”

Section: Samples and Experimentsmentioning

confidence: 99%

Polariton interactions in semiconductor microcavities

Deveaud

2016

Comptes Rendus. Physique

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In this review, we will try to summarize the results that we have obtained on the measurement of polariton interactions. We will describe here the samples, the experimental systems and some of the important results. We will also give a few highlights on the theoretical description of these results. One of the main topics of this review will be the observation of the Feshbach resonance for polaritons, and its interpretation through the coupling of two lower polaritons into a biexciton.

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“…Results.-Our sample is a 3λ /2 microcavity with 3 In-GaAs quantum wells (QWs, 10 nm thick, 4% Indium), and was previously described in the Ref. [31]. Distributed Bragg reflector (DBR) mirrors are GaAs/AlGaAs (85% Al) with 26 repeats on the bottom mirror and 23 repeats on the top.…”

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confidence: 99%

Transition from Propagating Polariton Solitons to a Standing Wave Condensate Induced by Interactions

et al. 2018

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We explore nonlinear transitions of polariton wavepackets, first, to a soliton and then to a standing wave polariton condensate in a multi-mode microwire system. At low polariton density we observe ballistic propagation of the multi-mode polariton wavepackets arising from the interference between different transverse modes. With increasing polariton density, the wavepackets transform into single mode bright solitons due to effects of both inter-modal and intra-modal polariton-polariton scattering. Further increase of the excitation density increases thermalisation speed leading to relaxation of the polariton density distribution in momentum space with the resultant formation of a non-equilibrium condensate manifested by a standing wave pattern across the whole sample.

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Design and characterization of high optical quality InGaAs/GaAs/AlGaAs-based polariton microcavities

Cited by 9 publications

References 27 publications

Backward Cherenkov radiation emitted by polariton solitons in a microcavity wire

Backward Cherenkov radiation emitted by polariton solitons in a microcavity wire

Polariton interactions in semiconductor microcavities

Transition from Propagating Polariton Solitons to a Standing Wave Condensate Induced by Interactions

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