Sonic gradient index lens for aqueous applications

Martin, Theodore P.; Nicholas, Michael; Orris, Gregory J.; Liang-Wu Cai; Torrent, Daniel; Sánchez-Dehesa, José
September 2010
Applied Physics Letters;9/13/2010, Vol. 97 Issue 11, p113503
Academic Journal
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.


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