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CHAOS ONDULATOIRE ET DIFFUSION MULTIPLE EN CAVITÉ MICRO-ONDES : Expériences modèles et applications

Abstract : Complex wave systems can be classified in two categories, whatever the type of wave equation involved. When complexity is induced by the geometry of boundaries one speaks of Wave Chaos. In the case of heterogeneous media complexity is due to multiple scattering. Microwave 2D cavities are ideal model systems to investigate both regimes on a macroscopic scale. In the Wave Chaos regime, a first experimental study of a rectangular cavity perturbed by a point-like metallic defect. Using a semiclassical approach based on periodic orbits, we provide evidence for the contributions of diffractive orbits in the length spectrum. Through the use of open strongly disordered dielectric media, the observation of 2D localized modes, in the sense of Anderson, is performed. We give details about the experimental setup and protocol to produce the spatial pattern of a localized mode. We experimentally demonstrate that the spectral widths of localized modes, related to leakage at the boundary, exponentially decrease with the system size. We also show that this decrease is controlled by the largest localization lengths.
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https://tel.archives-ouvertes.fr/tel-00460414
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Submitted on : Sunday, February 28, 2010 - 10:31:32 PM
Last modification on : Monday, October 12, 2020 - 10:27:38 AM
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  • HAL Id : tel-00460414, version 1

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David Laurent. CHAOS ONDULATOIRE ET DIFFUSION MULTIPLE EN CAVITÉ MICRO-ONDES : Expériences modèles et applications. Physique [physics]. Université Nice Sophia Antipolis, 2007. Français. ⟨tel-00460414⟩

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