Hybridization of Guided Surface Acoustic Modes in Unconsolidated Granular Media by a Resonant Metasurface

Antonio Palermo, Sebastian Krödel, Kathryn H. Matlack, Rachele Zaccherini, Vasilis K. Dertimanis, Eleni N. Chatzi, Alessandro Marzani, Chiara Daraio

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate the interaction of guided surface acoustic modes (GSAMs) in unconsolidated granular media with a metasurface, consisting of an array of vertical oscillators. We experimentally observe the hybridization of the lowest-order GSAM at the metasurface resonance, and note the absence of mode delocalization found in homogeneous media. Our numerical studies reveal how the stiffness gradient induced by gravity in granular media causes a down-conversion of all the higher-order GSAMs, which preserves the acoustic energy confinement. We anticipate these findings to have implications in the design of seismic-wave protection devices in stratified soils.

Original languageEnglish (US)
Article number054026
JournalPhysical Review Applied
Volume9
Issue number5
DOIs
StatePublished - May 17 2018

ASJC Scopus subject areas

  • General Physics and Astronomy

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