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Aerogel-based metasurfaces for perfect acoustic energy absorption

Abstract : The unusual viscoelastic properties of silica aerogel plates are efficiently used to design subwavelength perfect sound absorbers. We theoretically, numerically and experimentally report a perfect absorbing metamaterial panel made of periodically arranged resonant building blocks consisting of a slit loaded by a clamped aerogel plate backed by a closed cavity. The impedance matching condition is analyzed using the Argand diagram of the reflection coefficient, i.e., the trajectory of the reflection coefficient as a function of frequency in the complex plane. The lack or excess of losses in the system can be identified via this Argand diagram in order to achieve the impedance matching condition. The universality of this tool can be further exploited to design more complex metasurfaces for perfect sound absorption, thus allowing the rapid design of efficient absorbing metamaterials.
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https://hal.archives-ouvertes.fr/hal-02366223
Contributeur : Vicente Romero Garcia <>
Soumis le : vendredi 15 novembre 2019 - 17:36:36
Dernière modification le : mercredi 14 octobre 2020 - 03:46:10
Archivage à long terme le : : dimanche 16 février 2020 - 18:41:40

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Antonio Fernández-Marín, Noé Jiménez, Jean-Philippe Groby, José Sanchez-Dehesa, Vicente Romero-García. Aerogel-based metasurfaces for perfect acoustic energy absorption. Applied Physics Letters, American Institute of Physics, 2019, 115 (6), pp.061901. ⟨10.1063/1.5109084⟩. ⟨hal-02366223⟩

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