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Article Dans Une Revue Applied Physics Letters Année : 2019

Extreme low-frequency ultrathin acoustic absorbing metasurface

Yifan Zhu
Liyun Cao
Yong Li
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B. Assouar

Résumé

We introduce a multicoiled acoustic metasurface providing quasiperfect absorption (reaching 99.99% in experiments) at an extremely low-frequency of 50 Hz, simultaneously featuring an ultrathin thickness down to λ/527 (1.3 cm). In contrast to the state of the art, this original conceived multicoiled metasurface offers additional degrees of freedom capable of tuning the acoustic impedance effectively without increasing the total thickness. We provide analytical derivation, numerical simulation, and experimental demonstrations for this unique absorber concept, and discuss its particular physical mechanism. Furthermore, based on the same conceptual approach, we propose a broadband low-frequency metasurface absorber by coupling unit cells exhibiting different properties.

Dates et versions

hal-02374168 , version 1 (21-11-2019)

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Krupali Donda, Yifan Zhu, Shi-Wang Fan, Liyun Cao, Yong Li, et al.. Extreme low-frequency ultrathin acoustic absorbing metasurface. Applied Physics Letters, 2019, 115 (17), pp.173506. ⟨10.1063/1.5122704⟩. ⟨hal-02374168⟩
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