Reconfigurable acoustic metagrating for high efficiency anomalous reflections

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

Reconfigurable acoustic metagrating for high efficiency anomalous reflections

Chiang, YK Oberst, S

Melnikov, A Quan, L Marburg, S Alù, A Powell, D

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Publisher:: AMER PHYSICAL SOC
Publication Type:: Journal Article
Citation:: Physcal Review Applied, 2020, 13, (6), pp. 064067-064067
Issue Date:: 2020-10-01

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Field	Value	Language
dc.contributor.author	Chiang, YK
dc.contributor.author	Oberst, S https://orcid.org/0000-0002-1388-2749
dc.contributor.author	Melnikov, A
dc.contributor.author	Quan, L
dc.contributor.author	Marburg, S
dc.contributor.author	Alù, A
dc.contributor.author	Powell, D
dc.date.accessioned	2020-10-16T22:21:10Z
dc.date.available	2020-10-16T22:21:10Z
dc.date.issued	2020-10-01
dc.identifier.citation	Physcal Review Applied, 2020, 13, (6), pp. 064067-064067
dc.identifier.issn	2331-7019
dc.identifier.issn	2331-7019
dc.identifier.uri	http://hdl.handle.net/10453/143318
dc.description.abstract	Recent study revealed that the scattering behaviors of bianisotropic scatterers can be controlled by an additional degree of freedom, represented as Willis coupling, which can be endowed with asymmetric wave scattering to form an acoustic metagrating for wavefront manipulation. Here, we introduce a flexible acoustic metagrating, formed by periodic arrays of properly design Willis scatterers, for anomalous reflection with nearly unitary efficiency and significantly less necessity of fine discretization. Numerical approaches to predict the wave steering efficiency of the proposed acoustic metagratings with infinite and finite length are developed, which are utilized to demonstrate the strength and flexible features of the metagratings. Results reveal that the proposed acoustic metagrating can reroute incident wave into desired direction at a large angle with nearly unitary efficiency in reflection. The numerical predictions also show that the proposed designs offer a high efficient tunable platform in controlling the steering angles and operating frequencies. To practically realize the ability of extreme angle steering and tunable characteristics of the metagratings, designed structures are fabricated and examined experimentally. The acoustic wave is successfully rerouted to the targeted reflection angles by the finite metagrating. The flexibility regarding different steering angles and operating frequencies of the proposed metagratings are also demonstrated experimentally.
dc.language	English
dc.publisher	AMER PHYSICAL SOC
dc.relation	http://purl.org/au-research/grants/arc/DP200101708
dc.relation.ispartof	Physcal Review Applied
dc.relation.isbasedon	10.1103/PhysRevApplied.13.064067
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	02 Physical Sciences, 09 Engineering
dc.title	Reconfigurable acoustic metagrating for high efficiency anomalous reflections
dc.type	Journal Article
utslib.citation.volume	13
utslib.for	02 Physical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	open_access	*
pubs.consider-herdc	true
dc.date.updated	2020-10-16T22:20:49Z
pubs.issue	6
pubs.publication-status	Accepted
pubs.volume	13
utslib.citation.issue	6

Abstract:

Recent study revealed that the scattering behaviors of bianisotropic scatterers can be controlled by an additional degree of freedom, represented as Willis coupling, which can be endowed with asymmetric wave scattering to form an acoustic metagrating for wavefront manipulation. Here, we introduce a flexible acoustic metagrating, formed by periodic arrays of properly design Willis scatterers, for anomalous reflection with nearly unitary efficiency and significantly less necessity of fine discretization. Numerical approaches to predict the wave steering efficiency of the proposed acoustic metagratings with infinite and finite length are developed, which are utilized to demonstrate the strength and flexible features of the metagratings. Results reveal that the proposed acoustic metagrating can reroute incident wave into desired direction at a large angle with nearly unitary efficiency in reflection. The numerical predictions also show that the proposed designs offer a high efficient tunable platform in controlling the steering angles and operating frequencies. To practically realize the ability of extreme angle steering and tunable characteristics of the metagratings, designed structures are fabricated and examined experimentally. The acoustic wave is successfully rerouted to the targeted reflection angles by the finite metagrating. The flexibility regarding different steering angles and operating frequencies of the proposed metagratings are also demonstrated experimentally.

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http://hdl.handle.net/10453/143318