Physical Acoustics webinar: Deep sub-wavelength metamaterials for sound absorption for the reflection and ventilation problems

19 April - 19 April 2023

12:00 pmRegister


V. Romero-García
Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècncia de Valància, Camino de Vera S/N, 46022 València, Spain.N. Jiménez
Consejo Superior de Investigaciones Cient ́ıficas (CSIC), Universitat Polite`cnica de Vale`ncia, Camino de Vera S/N, 46085, València, Spain.V. Pagneux and J.-P. Groby
Laboratoire d’Acoustique de l’Universite ́ du Mans, LAUM – UMR 6613 CNRS, Le Mans Universite ́, Avenue Olivier Messiaen, 72085 LE MANS CEDEX 9, France.vicente.romero@univ-lemans.fr


The absorption of sound constitutes a prominent research line in audible acoustics. Acoustic absorbers developed up to now are efficient in the high frequency range with sizes comparable to the wavelength of the frequency to be absorbed. Contrary, in the low frequency regime huge dimensions leading to oversized treatments and high manufacture costs arise. In this talk we discuss acoustic metamaterials showing efficient absorption at low frequencies with deep subwavelength dimensions. On the one hand, by exploiting the slow sound effect, the resonance frequencies of the system can be shifted down to the low frequency range and the phase shift of the reflection coefficient can be perfectly tuned. On the other hand, the critical coupling conditions are introduced to achieve a perfect impedance matching allowing perfect absorption conditions. We will show in detail the design of the ultra-thin absorbers working in the low frequency regime for the reflection and transmission problems.


Vicent Romero García is Lecturer at Applied Mathematics Department at Polytechnic University of València developing his research at the Institut of Pure and Applied Maths (IUMPA). He was CNRS researcher from 2014 to 2022 at Acoustics Laboratory of Le Mans University (LAUM). He has more than 100 published papers in JCR journals and has participated as invited speaker in several international conferences. He has leaded the group of Metamaterials at LAUM and participated in the GdR Meta in France collaborating actively with UKAN. He has supervised 10 PhD and 10 post-docs. He has been also Principal Investigator in several research projects. His research is transversal and lies in the frontiers between different topics as Metamaterials, Crystalline structures, Acoustic materials and disordered systems. His interest is focused on the wave propagation in complex media paying special attention to several wave phenomena as perfect absorption, diffusion of waves, transparency, cloaking, band gap engineering, waveguiding, filtering, surface waves, and diffraction among others. His interest is both theoretical and experimental trying always to combine both in each work.
Posted on 6th April 2023 in Physical Acoustics, Events