Acoustic matamaterials for non-Hermitian sound propagation management

Helena Arias Casals; Tetsu Magariyachi; Ramon Herrero; Muriel Botey; Kęstutis Staliūnas

doi:10.1117/12.2624300

30 May 2022 Acoustic matamaterials for non-Hermitian sound propagation management

Helena Arias Casals, Tetsu Magariyachi, Ramon Herrero, Muriel Botey, Kęstutis Staliūnas

Proceedings Volume PC12130, Metamaterials XIII; PC121301Q (2022) https://doi.org/10.1117/12.2624300
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Conference Poster

Abstract

Non-Hermitian physics is an emerging field that for the unconventional management and control of wave fields. PT-symmetric metamaterials or dipoles have already been proposed as a flexible platform to redirect electromagnetic fields. Acoustic PT-dipoles have also been recently studied for sound guidance, showing an asymmetric scattering response. Therefore, we experimentally propose pairs of identical Helmholtz resonators with different losses distributed in the plane to create such dipoles (as electromagnetic analogues) and either concentrate the field, redirect it or even silence predefined areas. The experimental results confirm that the two-dimensional sound pressure field can be successfully modified on the bases of non-Hermitian physics.

Citation Download Citation

Helena Arias Casals, Tetsu Magariyachi, Ramon Herrero, Muriel Botey, and Kęstutis Staliūnas "Acoustic matamaterials for non-Hermitian sound propagation management", Proc. SPIE PC12130, Metamaterials XIII, PC121301Q (30 May 2022); https://doi.org/10.1117/12.2624300

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