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Imagerie de la génération et de la propagation des condensats de polaritons dans les microcavités ZnO.

Abstract : In semiconductors microcavities, exciton-polaritons arise from the strong coupling between excitons and photons. The polariton laser at room temperature, which is the first step to Bose-Einstein condensation (BEC), has been achieved in ZnO microcavities and the study of polariton condensates is the main issue of this work. We have studied the linear spectroscopy and measured the spatial properties of new high-Q ZnO microcavities grown on a patterned Si-substrate. Many generation geometries have been set up and compared to control the shape of polariton condensates. We have also measured and simulated polariton condensates propagation, using respectively 2D imaging experiments in near-field and far-field and by resolving the Gross-Pitaevskii equation. Then we were able to describe the variety of phenomena involved in the condensates propagation at 80 and 300 K for a tightly focused excitation compared to a wide 2D excitation. Those experiments pave the way for the development of polariton devices operating at 300 K in which polariton condensates can be patterned and controlled.
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Rereao Hahe. Imagerie de la génération et de la propagation des condensats de polaritons dans les microcavités ZnO.. Physique [physics]. Université Montpellier, 2015. Français. ⟨NNT : 2015MONTS161⟩. ⟨tel-01334745v2⟩

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