Bidirectional asymmetric acoustic focusing with two flat acoustic metasurfaces

doi:10.1088/1674-1056/27/12/124302

Abstract

We design an asymmetric transmission system (ATS) with two flat acoustic metasurfaces (AMs) to yield bidirectional asymmetric acoustic focusing (BAAF). The acoustic waves could be focused on both sides of the ATS with different focal lengths and intensities. To achieve high intensity energy concentration, the accelerating acoustic beams are selected to realize the BAAF. The working bandwidth of the BAAF based on our ATS could reach~0.4 kHz. It is found that by adjusting the distance between two flat AMs, the focal length and intensity of the bidirectional focusing could easily be modulated. Because the distance between two flat AMs is large enough, the BAAF even could be converted into a unidirectional acoustic focusing. The proposed BAAF may find applications in non-destructive evaluation, biomedical imaging and medical diagnosis.

Keywords: asymmetric focusing acoustic metasurface phase manipulation

Received: 15 August 2018
Revised: 11 September 2018
Accepted manuscript online:

PACS:	43.35.+d	(Ultrasonics, quantum acoustics, and physical effects of sound)
	43.25.+y	(Nonlinear acoustics)
	43.38.+n	(Transduction; acoustical devices for the generation and reproduction of sound)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11704193, 11674175, and 11704192), the “333” Project of Jiangsu Province, China (Grant No. BRA2017451), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province, China (Grant No. KYCX18_1185).

Corresponding Authors: Xing-Feng Zhu, Da-Jian Wu
E-mail: zhuxingfeng@njnu.edu.cn;wudajian@njnu.edu.cn

Cite this article:

Di-Chao Chen(陈帝超), Xing-Feng Zhu(朱兴凤), Qi Wei(魏琦), Da-Jian Wu(吴大建) Bidirectional asymmetric acoustic focusing with two flat acoustic metasurfaces 2018 Chin. Phys. B 27 124302

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