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Published January 6, 2014 | Published + Submitted
Journal Article Open

Experimental realization of a nonlinear acoustic lens with a tunable focus


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.

Additional Information

© 2014 AIP Publishing LLC. Received 30 October 2013; Accepted 10 December 2013; Published online 09 January 2014. This work was supported by the Office of Naval Research, YIP program, Award No. N000141010718 and from the National Science Foundation, Award No. 1200319. Paul Anzel was supported by a NASA Office of the Chief Technologists Space Technology Research Fellowship No. NNX11AN65H. We also thank Thevamaran Ramathasan for material property measurements and Wei-Hsun Lin for programming support.

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Published - 1.4857635.pdf

Submitted - 1308.1483v1.pdf


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