Self collimation of ultrasound in a 3D sonic crystal

Details Self collimation of ultrasound in a 3D sonic crystal Self collimation of ultrasound in a 3D sonic crystal

2009-02-10

arxiv.org/abs/0902.1707v2

Physics

Condensed Matter

Materials Science

3 figures, submitted to Applied Physics Letters

Scientific paper

We present the experimental demonstration of self-collimation (subdiffractive propagation) of an ultrasonic beam inside a three-dimensional sonic crystal. The crystal is formed by two crossed steel cylinders structures in a woodpile-like geometry disposed in water. Measurements of the 3D field distribution show that a narrow beam which diffractively spreads in the absence of the sonic crystal is strongly collimated in propagation inside the crystal, demonstrating the 3D self-collimation effect.

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