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

• 来源期刊: 中国物理B（英文版）
• 关键词: acoustic focusing Airy beam phase manipulation cavity structure
• 年，卷（期）: 2017,（11）
• 页码范围: 287-294
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/26/11/114304

摘要

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.