Acoustic meta-atom with experimentally verified maximum Willis coupling

Melnikov, A; Chiang, YK; Quan, L; Oberst, S; Alù, A; Marburg, S; Powell, D

Acoustic meta-atom with experimentally verified maximum Willis coupling

Melnikov, A

Chiang, YK Quan, L Oberst, S

Alù, A

Marburg, S Powell, D

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Publication Type:: Journal Article
Citation:: Nature Communications, 2019, 10 (1)
Issue Date:: 2019-12-01

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Field	Value	Language
dc.contributor.author	Melnikov, A https://orcid.org/0000-0001-9466-653X	en_US
dc.contributor.author	Chiang, YK	en_US
dc.contributor.author	Quan, L	en_US
dc.contributor.author	Oberst, S https://orcid.org/0000-0002-1388-2749	en_US
dc.contributor.author	Alù, A https://orcid.org/0000-0002-4297-5274	en_US
dc.contributor.author	Marburg, S	en_US
dc.contributor.author	Powell, D https://orcid.org/0000-0003-2123-1345	en_US
dc.date.available	2019-06-06	en_US
dc.date.issued	2019-12-01	en_US
dc.identifier.citation	Nature Communications, 2019, 10 (1)	en_US
dc.identifier.uri	http://hdl.handle.net/10453/134589
dc.description.abstract	© 2019, The Author(s). Acoustic metamaterials are structures with exotic acoustic properties, with promising applications in acoustic beam steering, focusing, impedance matching, absorption and isolation. Recent work has shown that the efficiency of many acoustic metamaterials can be enhanced by controlling an additional parameter known as Willis coupling, which is analogous to bianisotropy in electromagnetic metamaterials. The magnitude of Willis coupling in a passive acoustic meta-atom has been shown theoretically to have an upper limit, however the feasibility of reaching this limit has not been experimentally investigated. Here we introduce a meta-atom with Willis coupling which closely approaches this theoretical limit, that is much simpler and less prone to thermo-viscous losses than previously reported structures. We perform two-dimensional experiments to measure the strong Willis coupling, supported by numerical calculations. Our meta-atom geometry is readily modeled analytically, enabling the strength of Willis coupling and its peak frequency to be easily controlled.	en_US
dc.relation.ispartof	Nature Communications	en_US
dc.relation.isbasedon	10.1038/s41467-019-10915-5	en_US
dc.title	Acoustic meta-atom with experimentally verified maximum Willis coupling	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	10	en_US
utslib.for	0913 Mechanical Engineering	en_US
utslib.for	0912 Materials Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
utslib.copyright.status	open_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	10	en_US

Abstract:

© 2019, The Author(s). Acoustic metamaterials are structures with exotic acoustic properties, with promising applications in acoustic beam steering, focusing, impedance matching, absorption and isolation. Recent work has shown that the efficiency of many acoustic metamaterials can be enhanced by controlling an additional parameter known as Willis coupling, which is analogous to bianisotropy in electromagnetic metamaterials. The magnitude of Willis coupling in a passive acoustic meta-atom has been shown theoretically to have an upper limit, however the feasibility of reaching this limit has not been experimentally investigated. Here we introduce a meta-atom with Willis coupling which closely approaches this theoretical limit, that is much simpler and less prone to thermo-viscous losses than previously reported structures. We perform two-dimensional experiments to measure the strong Willis coupling, supported by numerical calculations. Our meta-atom geometry is readily modeled analytically, enabling the strength of Willis coupling and its peak frequency to be easily controlled.

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http://hdl.handle.net/10453/134589