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Non-Hermitian acoustic metamaterials: Role of exceptional points in sound absorption

Abstract : Effective non-Hermitian Hamiltonians are obtained to describe coherent perfect absorbing and lasing boundary conditions. PT symmetry of the Hamiltonians enables us to design configurations which perfectly absorb at multiple frequencies. Broadened and flat perfect absorption is predicted at the exceptional point of PT-symmetry breaking while, for a particular case, absorption is enhanced with the use of gain. The aforementioned phenomena are illustrated for acoustic scattering through Helmholtz resonators revealing how tailoring the non-Hermiticity of acoustic metamaterials leads to novel mechanisms for enhanced absorption.
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https://hal.archives-ouvertes.fr/hal-02406961
Contributeur : Olivier Richoux <>
Soumis le : jeudi 12 décembre 2019 - 12:01:06
Dernière modification le : mercredi 17 février 2021 - 15:26:08

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V. Achilleos, G. Theocharis, Olivier Richoux, V. Pagneux. Non-Hermitian acoustic metamaterials: Role of exceptional points in sound absorption. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2017, 95 (14), ⟨10.1103/PhysRevB.95.144303⟩. ⟨hal-02406961⟩

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