Diffusion, localisation et absorption de lumière en milieux désordonnés. Impact des corrélations spatiales du désordre

Abstract : In this thesis, different aspects of wave propagation in complex media are adressed. First, basicconcepts and tools of the propagation of waves in disordered media are reminded.Then, the Anderson localization regime is tackled for two-dimensional open systems. The localization is highlighted in a simple way from a calculation of the transmitted speckle pattern for a single configuration of the disorder with varying illumination conditions. Localized and diffused regimes are clearly differenciated, allowing to introduce a new critria for localization.Next, a weak scattering regime for which correlations of the disorder play a significant role is investigated. Namely, the study is focused on hyperuniform materials, where correlations are such that they are transparent compared with their uncorreleted equivalent. The influence of the correlations of the disorder on the absorption coefficient is also considered, but it is found to be moderated.The final part is dedicated to the fluctuations of the decay rate of an emitter, (e. g. fluorescentmolecule), embedded in a disordered medium as a function of its position. This new type of spatialcorrelation allows to extract information on the microscopic details of the medium (correlations) and the local environment of the source in an uncoupled way.
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Olivier Leseur. Diffusion, localisation et absorption de lumière en milieux désordonnés. Impact des corrélations spatiales du désordre. Optique [physics.optics]. Université Pierre et Marie Curie - Paris VI, 2016. Français. ⟨NNT : 2016PA066107⟩. ⟨tel-01390680⟩

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