Directional acoustic antennas based on Valley-Hall topological insulators

e-Archivo Repository

Show simple item record Zhang, Zhiwang Tian, Ye Wang, Yihe Gao, Shuxiang Cheng, Ying Liu, Xiaojun Christensen, Johan 2018-09-17T12:55:57Z 2018-09-17T12:55:57Z 2018-09-06
dc.identifier.bibliographicCitation Advanced materials, vol. 30, issue 36 (1803229)
dc.identifier.issn 0935-9648
dc.identifier.issn 1521-4095
dc.description.abstract Realizing directional acoustic signal transmittance and reception robust against surrounding noise and competing signals is crucial in many areas such as communication, navigation, and detection for medical and industrial purposes. The fundamentally wide‐angled radiation pattern of most current acoustic sensors and transducers displays a major limitation of the performance when it comes to precise targeting and probing of sound particular of interest in human speaking and hearing. Here, it is shown how topological acoustic valley transport can be designed to enable a unique beamforming mechanism that renders a superdirective needle‐like sound radiation and reception pattern. The strategy rests on out‐coupling valley‐polarized edge states, whose beam is experimentally detected in the far‐field with 10° width and a sound‐intensity enhancement factor ≈10. Furthermore, anti‐interference communication is proposed where sound is received from desired directions, but background noise from other directions is successfully suppressed. This type of topological acoustic antenna offers new ways to control sound with improved performance and functionalities that are highly desirable for versatile applications.
dc.description.sponsorship Z.Z. and Y.T. contributed equally to this work. This work was supported by National Key R&D Program of China (2017YFA0303702), NSFC (11674172, 11574148, and 11474162), Jiangsu Provincial NSF (BK20160018), the Fundamental Research Funds for the Central Universities (020414380001) and Nanjing University Innovation and Creative Program for Ph.D. candidate (CXCY17-11). J.C. acknowledges the support from the European Research Council (ERC) through the Starting Grant 714577 PHONOMETA and from the MINECO through a Ramón y Cajal grant (Grant No. RYC-2015-17156).
dc.format.extent 7
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
dc.rights © 2018 The Authors.
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
dc.subject.other Acoustic antennas
dc.subject.other Superdirectivity
dc.subject.other Topological edge states
dc.subject.other Valley-Hall phase
dc.title Directional acoustic antennas based on Valley-Hall topological insulators
dc.type article
dc.subject.eciencia Física
dc.subject.eciencia Materiales
dc.rights.accessRights openAccess
dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020/714577
dc.relation.projectID Gobierno de España. RYC-2015-17156
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationissue 36 (1803229)
dc.identifier.publicationlastpage 7
dc.identifier.publicationtitle Advanced materials
dc.identifier.publicationvolume 30
dc.identifier.uxxi AR/0000021636
 Find Full text

Files in this item

*Click on file's image for preview. (Embargoed files's preview is not supported)

The following license files are associated with this item:

This item appears in the following Collection(s)

Show simple item record