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Directional Acoustic Antennas Based on Valley‐Hall Topological Insulators
Author(s) -
Zhang Zhiwang,
Tian Ye,
Wang Yihe,
Gao Shuxiang,
Cheng Ying,
Liu Xiaojun,
Christensen Johan
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201803229
Subject(s) - acoustics , beamforming , interference (communication) , noise control , noise (video) , antenna (radio) , coupling (piping) , topological insulator , computer science , materials science , physics , telecommunications , noise reduction , channel (broadcasting) , quantum mechanics , artificial intelligence , metallurgy , image (mathematics)
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.