Acoustic focusing through two layer annuluses in air

doi:10.1088/1674-1056/25/10/104302

Abstract We report an acoustic focusing lens composed of two-layer annuluses made of metal cylinders in air. We find that the cylindrical waves can be focused into a perfect point without diffraction in the centre of the annuluses, which arises from the Mie-resonance modes in the annuluses. The focusing frequencies are related to the size of the inner annulus, and the focusing effect can be applied to the annuluses with different shapes and incident positions. Interesting applications of the focusing lens in the acoustic beam splitter and directional transmitter with energy enhancement are further discussed.

Keywords: acoustic focusing metamaterials annulus cylinder

Received: 03 April 2016
Revised: 15 May 2016
Accepted manuscript online:

PACS:	43.35.+d	(Ultrasonics, quantum acoustics, and physical effects of sound)
	43.20.+g	(General linear acoustics)

Fund: Project supported by the Major Program of the National Natural Science Foundation of China (Grant No. 51239005), the National Natural Science Foundation of China (Grant No. 11404147), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20140519), the China Postdoctoral Science Foundation (Grant No. 2015M571672), the Research Fund for Advanced Talents of Jiangsu University, China (Grant No. 11JDG118), and the Training Project of Young Backbone Teachers 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:

Yi-Jun Guan(管义钧), Hong-Xiang Sun(孙宏祥), Shu-Sen Liu(刘树森), Shou-Qi Yuan(袁寿其), Jian-Ping Xia(夏建平), Yong Ge(葛勇) Acoustic focusing through two layer annuluses in air 2016 Chin. Phys. B 25 104302

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