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Communication Dans Un Congrès Année : 2022

The experimental search for 3D Anderson localization of ultrasound in a resonant suspension made of soft metallic micro-beads

Fanambinana Delmotte
  • Fonction : Auteur
  • PersonId : 1185542
Gérald Clisson
  • Fonction : Auteur
  • PersonId : 1185543
Jacques Leng
John Page
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  • PersonId : 1085308

Résumé

In disordered scattering media, the energy associated with the multiply scattered waves normally follows, on average, a diffusion process (like heat). For strongly scattering media, particularly systems of resonant scatterers, the mean free path can be smaller than the wavelength, near the particle resonances, and the wave energy may remain confined in the vicinity of the source, leading to Anderson localization [1]. This complex wave phenomenon has been unambiguously demonstrated for ultrasound transmitted through 3D elastic networks [2] but the in-situ search for 3D Anderson Localization of ultrasound is still challenging [3]. Here, we propose to study resonant systems composed of monodisperse soft metallic micro-beads randomly dispersed into a fluid-like matrix [4]. Through time- and position-resolved experiments, we are able to measure the diffusivity as a function of the frequency inside the medium. This transport parameter exhibits strong variations that are due to the sharp shape resonances of the micro-beads. At the resonances frequencies of these soft particles, the diffusivity becomes very low and it is accompanied by a deviation from the conventional diffusive transport of the wave intensity, namely a subdiffusive regime. [1] A. Lagendijk & B. van Tiggelen, “Resonant multiple scattering of light”, Rep. Phys. 270, 143, 1996 [2] H. Hu, A. Strybulevych, J.H. Page, S.E. Skipetrov, and B. A. van Tiggelen, “Localization of ultrasound in a three-dimensional elastic network,” Nature Phys. 4, 945, 2008 [3] B. Tallon, T. Brunet and J.H. Page, “In situ search for 3D Anderson localization of ultrasound in resonant emulsions”, URSI International Symposium on Electromagnetic Theory (EMTS), 262, 2016. [4] F. Delmotte, T. Brunet, G. Clisson and J. Leng, “Measurement of the ultrasonic diffusion coefficient in a resonant multiple scattering suspension”, J. Phys.: Conf. Ser. 1761, 012004, 2021.
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Dates et versions

hal-03848346 , version 1 (10-11-2022)

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  • HAL Id : hal-03848346 , version 1

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Fanambinana Delmotte, Gérald Clisson, Jacques Leng, Thomas Brunet, John Page. The experimental search for 3D Anderson localization of ultrasound in a resonant suspension made of soft metallic micro-beads. 16ème Congrès Français d'Acoustique, CFA2022, Société Française d'Acoustique; Laboratoire de Mécanique et d'Acoustique, Apr 2022, Marseille, France. ⟨hal-03848346⟩
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