Article Dans Une Revue Physical Review B Année : 2023

Ultrasonic wave transport in concentrated disordered resonant emulsions

Thomas Brunet
John H Page
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Résumé

We show how resonant (near-field) coupling affects wave transport in disordered media through ultrasonic experiments in concentrated suspensions. The samples consist of resonant emulsions in which oil droplets are suspended in a liquid gel. By varying the volume fraction of droplets φ up to 40%, the limits of the independent scattering approximation are experimentally demonstrated as soon as φ > 10%. For these concentrated samples, the proximity of resonant scatterers induces a renormalization of the surrounding medium, leading to a reduction in scattering strength. Hence, maximum scattering is reached at an intermediate droplet concentration (20% < φ < 30%) where subdiffusive wave transport is observed. These results are very relevant for designing materials for the study of wave transport phenomena such as Anderson localization.

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hal-04190668 , version 1 (29-08-2023)

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Benoit Tallon, Thomas Brunet, John H Page. Ultrasonic wave transport in concentrated disordered resonant emulsions. Physical Review B, 2023, 108 (6), pp.L060202. ⟨10.1103/PhysRevB.108.L060202⟩. ⟨hal-04190668⟩
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