Sonic gradient index lens for aqueous applications

By T. P. Martin, M. Nicholas, G. Orris, L. Cai, D. Torrent, José Sánchez-Dehesa. 2010

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We study the acoustic scattering properties of a phononic crystal designed to behave as a gradient index lens in water, both experimentally and theoretically. The gradient index lens is designed using a square lattice of stainless-steel cylinders based on a multiple scattering approach in the homogenization limit. We experimentally demonstrate that the lens follows the graded index equations derived for optics by mapping the pressure intensity generated from a spherical source at 20 kHz. We find good agreement between the experimental result and theoretical modeling based on multiple scattering theory.

Subfields: Aerospace Engineering, Biomedical Engineering, Oceanography

View Paper: https://www.semanticscholar.org/paper/456463f0895ae5033626ba869c058abf6ebe9f1f