Experimental realization of a nonlinear acoustic lens with a tunable focus

被引：73

作者：

Donahue, Carly M. ^{[1
]}

Anzel, Paul W. J. ^{[1
]}

Bonanomi, Luca ^{[2
]}

Keller, Thomas A. ^{[1
]}

Daraio, Chiara ^{[1
,2
]}

机构：

[1] CALTECH, Grad Aerosp Labs GALCIT, Pasadena, CA 91125 USA

[2] Swiss Fed Inst Technol, Dept Mech & Proc Engn D MAVT, Zurich, CH, Switzerland

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 01期

基金：

美国国家科学基金会;

关键词：

SOLITARY WAVES; GENERATION; ULTRASOUND;

D O I：

10.1063/1.4857635

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We realize a nonlinear acoustic lens composed of a two-dimensional array of sphere chains interfaced with water. The chains are able to support solitary waves which, when interfaced with a linear medium, transmit compact pulses with minimal oscillations. When focused, the lens is able to produce compact pressure pulses of high amplitude, the "sound bullets." We demonstrate that the focal point can be controlled via pre-compression of the individual chains, as this changes the wave speed within them. The experimental results agree well both spatially and temporally with analytical predictions over a range of focus locations. (C) 2014 AIP Publishing LLC.

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