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Microcavités semiconductrices structurées pour la génération paramétrique optique

Abstract : This work is devoted to optical parametric phenomena in structured semiconductor microcavities. Non-linearities of the excitons in quantum wells, associated with optical confinement, make parametric processes possible. In the oscillation regime, a pair of beams is generated, whose intensity correlations are potentially of quantum nature. In planar cavities, the oscillation conditions are restrictive (pump at non-zero angle, low temperatures for strong coupling), and the correlations are limited by the beams intensity unbalance. We study two approaches to structuring in order to lift these restrictions. In the first approach, the microcavities are etched as wires. The lateral confinement produces a collection of modes. We show the existence of energy-degenerate parame- tric oscillation in these wires. The polarization and power behaviors are studied and validate a model of interacting polaritons. We measure the intensity correlations of the generated beams, compared to a model of fluctuations. In the second approach, we study coupled microcavities. Modes are delocalized over the multiples cavities. We show parametric oscillation at low temperature. Then we analyze a sample designed for parametric generation at room temperature. The spectral study validates the model of a 2-level system, which is used to predict the conditions to reach the regime of oscillation. Finally, we present a study of the polarization properties of the parametric generation. We measure over a wide range of parameters the ratio of the interaction potentials that conserve and reverse polarization between excitons.
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https://tel.archives-ouvertes.fr/tel-00597522
Contributor : Timothée Lecomte <>
Submitted on : Wednesday, June 1, 2011 - 11:04:17 AM
Last modification on : Thursday, December 17, 2020 - 6:40:02 PM
Long-term archiving on: : Friday, September 2, 2011 - 2:23:59 AM

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  • HAL Id : tel-00597522, version 1

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Timothée Lecomte. Microcavités semiconductrices structurées pour la génération paramétrique optique. Matière Condensée [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2011. Français. ⟨tel-00597522⟩

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