Broadband acoustic focusing by Airy-like beams based on acoustic metasurfaces

An acoustic metasurface (AM) composed of space-coiling subunits is proposed to generate acoustic Airy-like beams (ALBs) by manipulating the transmitted acoustic phase. The self-accelerating, self-healing, and non-diffracting features of ALBs are demonstrated using finite element simulations. We furt...

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Bibliographic Details
Published in:Journal of applied physics 2018-01, Vol.123 (4)
Main Authors: Chen, Di-Chao, Zhu, Xing-Feng, Wei, Qi, Wu, Da-Jian, Liu, Xiao-Jun
Format: Article
Language:English
Subjects:
Acoustic propagation
Acoustics
Applied physics
Beams (radiation)
Broadband
Coiling
Finite element method
Incident waves
Medical imaging
Metasurfaces
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Summary:An acoustic metasurface (AM) composed of space-coiling subunits is proposed to generate acoustic Airy-like beams (ALBs) by manipulating the transmitted acoustic phase. The self-accelerating, self-healing, and non-diffracting features of ALBs are demonstrated using finite element simulations. We further employ two symmetrical AMs to realize two symmetrical ALBs, resulting in highly efficient acoustic focusing. At the working frequency, the focal intensity can reach roughly 20 times that of the incident wave. It is found that the highly efficient acoustic focusing can circumvent obstacles in the propagating path and can be maintained in a broad frequency bandwidth. In addition, simply changing the separation between the two AMs can modulate the focal length of the proposed AM lens. ALBs generated by AMs and the corresponding AM lens may benefit applications in medical ultrasound imaging, biomedical therapy, and particle trapping and manipulation.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5010705