Abstract

We propose to achieve efficient emission of highly directional sound beams from multiple monopole sources embedded in a subwavelength enclosure. Without the enclosure, the emitted sound fields have an indistinguishable or omnidirectional radiation directivity in far fields. The strong directivity formed in the presence of the enclosure is attributed to interference of sources under degenerate Mie resonances in the enclosure of anisotropic property. Our numerical simulations of sound emission from the sources demonstrate the radiation of a highly directed sound beam of unidirectional or bidirectional patterns, depending on how the sources are configured inside the enclosure. Our scheme, if achieved, can solve the challenging problem of poor directivity of a subwavelength sound system, and can guide beam forming and collimation by miniaturized devices.

Details

Title
Directional sound beam emission from a configurable compact multi-source system
Author
Zhao, Jiajun 1   VIAFID ORCID Logo  ; Rasha Al Jahdali 2 ; Zhang, Likun 3   VIAFID ORCID Logo  ; Wu, Ying 2   VIAFID ORCID Logo 

1  King Abdullah University of Science and Technology (KAUST), Division of Computer, Electrical and Mathematical Sciences and Engineering, Thuwal, Saudi Arabia; GOWell International LLC, Houston, Texas, USA 
2  King Abdullah University of Science and Technology (KAUST), Division of Computer, Electrical and Mathematical Sciences and Engineering, Thuwal, Saudi Arabia 
3  National Center for Physical Acoustics and Department of Physics and Astronomy, University of Mississippi, University, Mississippi, USA 
Pages
1-8
Publication year
2018
Publication date
Jan 2018
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41598-017-16792-6
ProQuest document ID
1988941738
Copyright
© 2018. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.