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research article

Extreme Spatial Dispersion in Nonlocally Resonant Elastic Metamaterials

Bossart, Aleksi Antoine  
•
Fleury, Romain  
2023
Physical Review Letters

To date, the vast majority of architected materials have leveraged two physical principles to control wave behavior, namely, Bragg interference and local resonances. Here, we describe a third path: structures that accommodate a finite number of delocalized zero-energy modes, leading to anomalous dispersion cones that nucleate from extreme spatial dispersion at 0 Hz. We explain how to design such zero-energy modes in the context of elasticity and show that many of the landmark wave properties of metamaterials can also be induced at an extremely subwavelength scale by the associated anomalous cones, without suffering from the same bandwidth limitations. We then validate our theory through a combination of simulations and experiments. Finally, we present an inverse design method to produce anomalous cones at desired locations in k space.

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Type
research article
DOI
10.1103/PhysRevLett.130.207201
Author(s)
Bossart, Aleksi Antoine  
Fleury, Romain  
Date Issued

2023

Published in
Physical Review Letters
Volume

130

Article Number

207201

Subjects

metamaterials

•

mechanics

•

acoustics

•

graphs

•

negative refraction

•

non-locality

•

spatial dispersion

Note

Title of the preprint version : Extreme Spatial Dispersion in Nonlocally-Resonant Elastic Metamaterials

URL

Preprint

https://arxiv.org/abs/2209.02618
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LWE  
FunderGrant Number

FNS

181232

Available on Infoscience
May 22, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/197814
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