Enhanced negative-index collimation by overlapped second band of square lattice sonic crystals

Shen, F; Zhu, H; Zhu, G; Shi, Q; Schulte, J

Enhanced negative-index collimation by overlapped second band of square lattice sonic crystals

Shen, F Zhu, H Zhu, G Shi, Q Schulte, J

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Chinese Journal of Physics, 2020, 63, pp. 201-206
Issue Date:: 2020-02-01

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Field	Value	Language
dc.contributor.author	Shen, F
dc.contributor.author	Zhu, H
dc.contributor.author	Zhu, G
dc.contributor.author	Shi, Q
dc.contributor.author	Schulte, J https://orcid.org/0000-0001-8845-8099
dc.date.accessioned	2020-11-23T03:05:10Z
dc.date.available	2020-11-23T03:05:10Z
dc.date.issued	2020-02-01
dc.identifier.citation	Chinese Journal of Physics, 2020, 63, pp. 201-206
dc.identifier.issn	0577-9073
dc.identifier.issn	0577-9073
dc.identifier.uri	http://hdl.handle.net/10453/144241
dc.description.abstract	© 2019 Acoustic wave collimation and enhancement are systematically investigated in the overlapped second and third bands of a two-dimensional square lattice sonic crystals by analyzing the band structure, equifrequency contour and field distribution. We find the collimation stems from a small negative-index of the second band, and an additional concave entrance can improve the collimation performance in the far field region. But for the third band, negative, zero, positive refraction and wave splitting may occur at the same time due to the simultaneous excitation of multiple Bloch modes, which ultimately destroy the collimation beam of the second band in the near field region. This work provides an insight into the collimation properties of the overlapped bands of sonic crystals with potential application in acoustic directional emission and wave manipulation.
dc.language	en
dc.publisher	Elsevier BV
dc.relation.ispartof	Chinese Journal of Physics
dc.relation.isbasedon	10.1016/j.cjph.2019.11.013
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	01 Mathematical Sciences, 02 Physical Sciences
dc.subject.classification	General Physics
dc.title	Enhanced negative-index collimation by overlapped second band of square lattice sonic crystals
dc.type	Journal Article
utslib.citation.volume	63
utslib.for	01 Mathematical Sciences
utslib.for	02 Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2020-11-23T03:05:04Z
pubs.publication-status	Published
pubs.volume	63

Abstract:

© 2019 Acoustic wave collimation and enhancement are systematically investigated in the overlapped second and third bands of a two-dimensional square lattice sonic crystals by analyzing the band structure, equifrequency contour and field distribution. We find the collimation stems from a small negative-index of the second band, and an additional concave entrance can improve the collimation performance in the far field region. But for the third band, negative, zero, positive refraction and wave splitting may occur at the same time due to the simultaneous excitation of multiple Bloch modes, which ultimately destroy the collimation beam of the second band in the near field region. This work provides an insight into the collimation properties of the overlapped bands of sonic crystals with potential application in acoustic directional emission and wave manipulation.

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http://hdl.handle.net/10453/144241