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Strong light matter coupling in semiconductor nanostructures. Nonlinear effects and applications

Abstract : Exciton-polaritons, mixed light-matter particles are on their way to break into the world of optoelectronic devices thanks to unique properties and nonlinear effects in polariton systems. The present thesis is devoted to the investigation of nonlinear effects and applications of exciton-polaritons. The first part of the thesis investigates nonlinear effects such as the polariton parametric oscillator and the polariton bistability: A new mathematical approach in between the semiclassical and the fully coherent picture is developed and the crucial impact of fluctuations on the bistability is in the focus of this work. Applications of excitonpolaritons are the subject of the second part. ZnO based structures are suited candidates for room temperature polariton lasing and we simulate such a structure numerically in dependence of the quality factor and the Rabi splitting. Beside the laser, the unique spin structure opens a lot of possibilities. In analogy to the spintronic Datta and Das spin transistor a new polaritonic spin transistor is developed and presented. Also other analogies, such as the Josephson effect are predicted for polaritons. This effect is complex enough to show chaotic behavior in some parameter range. The chaotic oscillations can be used for secure communication. The last part of the thesis is devoted to 0D polaritons and to an on-chip source of entangled photon pairs. Existing problems blocking the realization of highly correlated two-photon sources based on the biexciton decay in quantum dots can be overcome in the strong coupling regime.
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Robert Johne. Strong light matter coupling in semiconductor nanostructures. Nonlinear effects and applications. Physique Atomique [physics.atom-ph]. Université Blaise Pascal - Clermont-Ferrand II, 2009. Français. ⟨NNT : 2009CLF21952⟩. ⟨tel-00725283⟩

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