CaltechAUTHORS
  A Caltech Library Service

Enhancement of deep-subwavelength band gaps in flat spiral-based phononic metasurfaces using the trampoline phenomena

Bilal, Osama R. and Foehr, André and Daraio, Chiara (2020) Enhancement of deep-subwavelength band gaps in flat spiral-based phononic metasurfaces using the trampoline phenomena. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20200311-155918643

[img] PDF - Submitted Version
See Usage Policy.

1357Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20200311-155918643

Abstract

Elastic and acoustic metamaterials can sculpt dispersion of waves through resonances. In turn, resonances can give rise to negative effective properties, usually localized around the resonance frequencies, which support band gaps at subwavelength frequencies (i.e., below the Bragg-scattering limit). However, the band gaps width correlates strongly with the resonators' mass and volume, which limits their functionality in applications. Trampoline phenomena have been numerically and experimentally shown to broaden the operational frequency ranges of two-dimensional, pillar-based metamaterials through perforation. In this work, we demonstrate trampoline phenomena in lightweight and planar lattices consisting of arrays of Archimedean spirals in unit cells. Spiral-based metamaterials have been shown to support different band gap opening mechanisms, namely, Bragg-scattering, local resonances and inertia amplification. Here, we numerically analyze and experimentally realize trampoline phenomena in planar metasurfaces for different lattice tessellations. Finally, we carry out a comparative study between trampoline pillars and spirals and show that trampoline spirals outperform the pillars in lightweight, compactness and operational bandwidth.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/2001.10508arXivDiscussion Paper
ORCID:
AuthorORCID
Bilal, Osama R.0000-0003-3803-5084
Foehr, André0000-0003-0941-5424
Daraio, Chiara0000-0001-5296-4440
Additional Information:We are grateful for T. Jung's help with the additive manufacturing. O. R. Bilal acknowledges the support from the ETH Postdoctoral Fellowship FEL-26 15-2. This work was partially supported by ETH grant No. ETH-24 15-2.
Funders:
Funding AgencyGrant Number
ETH ZurichFEL-26 15-2
ETH ZurichETH-24 15-2
Record Number:CaltechAUTHORS:20200311-155918643
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200311-155918643
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101870
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Mar 2020 23:12
Last Modified:11 Mar 2020 23:12

Repository Staff Only: item control page