In the last few years, highly anisotropic metamaterials have been explored in various geometries, showcasing interesting routes to achieve better control of sound propagation. As an extreme example, hyperbolic metasurfaces have been shown to offer broadband enhanced sound-matter interactions and diffraction-less propagation of acoustic waves, providing opportunities for sub-diffraction imaging and enhanced sound emission. In this study, we show that structure design of a locally resonant metamaterial enables extreme anisotropic responses, ranging from elliptic to hyperbolic propagation of acoustic surface waves, offering interesting opportunities for extreme sound guiding and steering at the subwavelength scale well compatible with a wide range of additive manufacturing techniques.
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September 2021
September 21 2021
Extreme anisotropy and dispersion engineering in locally resonant acoustic metamaterialsa)
Special Collection:
Additive Manufacturing and Acoustics
Simon Yves;
Simon Yves
Photonics Initiative, Advanced Science Research Center, City University of New York
, New York, New York 10031, USA
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Andrea Alù
Andrea Alù
b)
Photonics Initiative, Advanced Science Research Center, City University of New York
, New York, New York 10031, USA
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b)
Also at: Physics Program, Graduate Center, City University of New York, New York, NY 10016, USA. Electronic mail: aalu@gc.cuny.edu, ORCID: 0000-0002-4297-5274.
a)
This paper is part of a special issue on Additive Manufacturing and Acoustics.
J. Acoust. Soc. Am. 150, 2040–2045 (2021)
Article history
Received:
April 30 2021
Accepted:
August 23 2021
Citation
Simon Yves, Andrea Alù; Extreme anisotropy and dispersion engineering in locally resonant acoustic metamaterials. J. Acoust. Soc. Am. 1 September 2021; 150 (3): 2040–2045. https://doi.org/10.1121/10.0006237
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