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Etude des microcavités planaires ZnO dans le régime de coupage fort

Abstract : This thesis reports a spectroscopic study of the light-matter interaction in ZnO based microcavities.We have examined several planar microcavities which dier from the previous ones through their structures and their epitaxial processes. The theoretical advantages that have driven these realizations are discussed and veried through experimental measurements of reectivity and photoluminescence as a function of temperature and excitation intensity. Thanks to the optical characterics of these new cavities, we have studied the coherent light emission based on the condensation of polaritons at high temperature, up to 300K. High optical quality factor and high Rabi splitting allow to deeply analyze the relationship which exists between the photonic fraction of polaritons and the threshold excitation value corresponding to the occurrence of the polariton laser eect. This work highlights two identied physical processes which contribute to the laser eect : the thermodynamic and kinetic regimes. Moreover, it appears that the exciton-phonon interaction constitutes a specic phenomenon which allows to reduce the polariton laser threshold.
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  • HAL Id : tel-02122747, version 1

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Laurent Orosz. Etude des microcavités planaires ZnO dans le régime de coupage fort. Science des matériaux [cond-mat.mtrl-sci]. Université Blaise Pascal - Clermont-Ferrand II, 2013. Français. ⟨NNT : 2013CLF22412⟩. ⟨tel-02122747⟩

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