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Non-linear Dynamics of One-dimensional Polaritons Gases in Semiconductor Microcavities

Dimitrii Tanese (physicien).)

出版	2013
URL	http://books.google.com.hk/books?id=jRL2oQEACAAJ&hl=&source=gbs_api

註釋

This PhD thesis is dedicated to the study of one-dimensional polariton gases in semiconductor microcavities. Thanks to the control on the etching of the microstructures, a full engineering of the 1D potential has been obtained and several geometries have been investigated. We have studied the propagation of polaritons inside photonic wires and we evidenced strong reduction of the backscattering against disorder driven by interparticle interactions. Polariton condensation has been investigated in a one-dimensional periodic potential. We have shown how repulsive interactions create localized states inside the energy gap. The nature of these states depends on the relative strength between interparticle interactions and the interactions with the excitonic reservoir. In a time resolved-experiment we have shown the dynamical transition from a regime dominated by interactions with the reservoir to a regime where self-interactions give rise to the formation of gap solitons. Additionally, the potential induced by the interactions with the reservoir allowed us to combine an energy gradient with the periodic lattice. In this configuration, we have observed polaritons Bloch oscillations. Thanks to the potential engineering, we have also implemented a Fibonacci quasi-periodic potential. In this configuration, we have observed the fractal character of the polariton spectrum. Finally, we present a polariton interferometer. The optical control of the phase of the polariton flow allows controlling the intensity and the polarization of the beam transmitted through the device.