Abstract
This talk will focus on various topics connected with wave propagation and inhomogeneous media. Their common factor is the impossibility to obtain a correct physical description within effective medium type theories: these problems cannot be tackled through an homogeneization of the medium. One of the topics is Anderson localization for classical waves in a random medium: a pedagogical approach to the theoretical aspects of this problem will be presented and the experimental status reviewed. Another topic will be the reflectance/transmittance/absorption properties of a disordered granular metal-insulator film under a perpendicularly incident electromagnetic (infra-red, hyperfrequences,…) wave. Here again effective medium theories can fail badly. New approaches will be presented. The study of nonlinear waves in inhomogeneous media raises also new problems which cannot always be discussed in the spirit of effective medium theories.
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