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

Palermo, Antonio and Krödel, Sebastian and Matlack, Kathryn H. and Zaccherini, Rachele and Dertimanis, Vasilis K. and Chatzi, Eleni N. and Marzani, Alessandro and Daraio, Chiara (2018) Hybridization of Guided Surface Acoustic Modes in Unconsolidated Granular Media by a Resonant Metasurface. Physical Review Applied, 9 (5). Art. No. 054026. ISSN 2331-7019. http://resolver.caltech.edu/CaltechAUTHORS:20180517-100308712

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevApplied.9.054026DOIArticle
ORCID:
AuthorORCID
Palermo, Antonio0000-0001-9431-0461
Krödel, Sebastian0000-0002-9218-8578
Matlack, Kathryn H.0000-0001-7387-2414
Daraio, Chiara0000-0001-5296-4440
Additional Information:© 2018 American Physical Society. Received 3 November 2017; revised manuscript received 1 April 2018; published 17 May 2018. We acknowledge Viktor Thöni for the help in the construction of the experimental setup and for the initial measurements of the GSAMs velocities. We thank Virginia von Streng for the help in designing the 3D printed resonators and Isotta Carpi for the help in the preliminary numerical models. This work was partially supported by the Swiss National Science Foundation (Grant No. 164375) to C. D., by the ETH Research Grant (49 17-1) to R. Z., and an ETH Postdoctoral Fellowship to K. H. M.
Funders:
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)164375
ETH Zurich49 17-1
ETH Postdoctoral FellowshipUNSPECIFIED
Record Number:CaltechAUTHORS:20180517-100308712
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180517-100308712
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86438
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 May 2018 14:50
Last Modified:18 May 2018 14:50

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