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Chin. Phys. B, 2017, Vol. 26(11): 114304    DOI: 10.1088/1674-1056/26/11/114304
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Broadband acoustic focusing by symmetric Airy beams with phased arrays comprised of different numbers of cavity structures

Jiao Qian(钱姣)1, Bo-Yang Liu(刘博阳)1, Hong-Xiang Sun(孙宏祥)1,2, Shou-Qi Yuan(袁寿其)1, Xiao-Zhu Yu(俞笑竹)1
1. Research Center of Fluid Machinery Engineering and Technology, Faculty of Science, Jiangsu University, Zhenjiang 212013, China;
2. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
Abstract  

We realize broadband acoustic focusing effect by employing two symmetric Airy beams generated from phased arrays, in which the units of the phased arrays consist of different numbers of cavity structures, each of which is composed of a square cavity and two inclined channels in air. The exotic phenomenon arises from the energy overlapping of the two symmetric Airy beams. Besides, we demonstrate the focusing performance with high self-healing property, and discuss the effects of structure parameters on focusing performance, and present the characteristics of the cavity structure with straight channels. Compared with other acoustic lenses, the proposed acoustic lens has advantages of broad bandwidth (about 1.4 kHz), high self-healing property of focusing performance, and free adjustment of focal length. Our finding should have great potential applications in ultrasound imaging and medical diagnosis.

Keywords:  acoustic focusing      Airy beam      phase manipulation      cavity structure  
Received:  29 July 2017      Revised:  09 September 2017      Published:  05 November 2017
PACS:  43.35.+d (Ultrasonics, quantum acoustics, and physical effects of sound)  
  43.25.+y (Nonlinear acoustics)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant Nos. 11774137 and 11404147), the Major Program of the National Natural Science Foundation of China (Grant No. 51239005), the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK20140519 and BK20140523), the Jiangsu Qing Lan Project, China, and the Practice Innovation Training Program Projects for Industrial Center of Jiangsu University, China.

Corresponding Authors:  Hong-Xiang Sun, Shou-Qi Yuan     E-mail:  jsdxshx@ujs.edu.cn;shouqiy@ujs.edu.cn

Cite this article: 

Jiao Qian(钱姣), Bo-Yang Liu(刘博阳), Hong-Xiang Sun(孙宏祥), Shou-Qi Yuan(袁寿其), Xiao-Zhu Yu(俞笑竹) Broadband acoustic focusing by symmetric Airy beams with phased arrays comprised of different numbers of cavity structures 2017 Chin. Phys. B 26 114304

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