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2016-05-12 Matthieu RUPIN

Séminaires du Département d'Acoustique Physique APY Institut de Mécanique et d'Ingénierie Université de Bordeaux -­‐ UMR CNRS 5295 Matthieu RUPIN Équipe Ondes en Milieux Complexes, Institut Langevin, Paris jeudi 12 mai 2016, 14h-­‐15h I2M, salle de conférences bât. A4 RdC Elastic Metamaterials: from seismology to bio-­‐physics The physics of waves has regained a lot of interest within the last two decades with the advent of metamaterials. The latter refer to man-­‐
made composite media engineered at a microscopic scale with respect to the wavelength. Whatever the type of waves the same approach is conducted: the response of the sub-­‐wavelength elementary units give rise to macroscopic effective properties for the propagation of waves. In this talk, I will present two different kinds of metamaterials related to very different applications: seismology and bio-­‐physics. First, I will show experimental and theoretical results on a metama-­‐
terial dedicated to elastic waves with seismic applications as objective. The experiment is conducted on a thin table-­‐size aluminum plate coupled to an ensemble of long aluminum rods acting as sub-­‐
wavelength resonators. This system is very instructive because of the presence of different types of waves in both the plate and the rods. Second, I will present an example in the audible acoustic range of a metamaterial that exhibits a spatial non-­‐uniformity of its properties which mimics the behavior of a dead cochlea. When active processes are introduced in the resonators we demonstrate the possibility to exploit non-­‐linearities to reproduce some known features of the living cochlea. contact olivier.poncelet@u-­‐ Université de Bordeaux Site bât. A4, RdC 351, Cours de la Libération 33405 TALENCE CEDEX -­‐ FRANCE Tél. +33 (0)5 40 00 87 88 Fax +33 (0)5 40 00 69 64 http://i2m.u-­‐
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