Generation of Sound Bullets with a Nonlinear Acoustic Lens

Details Generation of Sound Bullets with a Nonlinear Acoustic Lens Generation of Sound Bullets with a Nonlinear Acoustic Lens

2009-08-31

arxiv.org/abs/0909.0068v1

Physics

Condensed Matter

Soft Condensed Matter

19 pages, 7 figures, includes supplementary information

Scientific paper

Acoustic lenses are employed in a variety of applications, from biomedical imaging and surgery, to defense systems, but their performance is limited by their linear operational envelope and complexity. Here we show a dramatic focusing effect and the generation of large amplitude, compact acoustic pulses (sound bullets) in solid and fluid media, enabled by a tunable, highly nonlinear acoustic lens. The lens consists of ordered arrays of granular chains. The amplitude, size and location of the sound bullets can be controlled by varying static pre-compression on the chains. We support our findings with theory, numerical simulations, and corroborate the results experimentally with photoelasticity measurements. Our nonlinear lens makes possible a qualitatively new way of generating high-energy acoustic pulses, enabling, for example, surgical control of acoustic energy.

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