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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.
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Helena Arias Casals, Tetsu Magariyachi, Ramon Herrero, Muriel Botey, 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