Abstract
The negative refraction behavior and imaging effect for acoustic waves in two-dimensional sonic crystals consisting of hexagonal arrays of steel cylinders in air are studied in this paper. The negative refraction and left-handed behaviors are demonstrated by the simulation of a Gaussian beam through a slab of the sonic crystal. Imaging effects by the sonic crystal slab with effective refraction index and are investigated, respectively. Far-field images by two-dimensional sonic-crystal-based superlens for both cases are obtained by exact numerical simulations, which is in agreement with the physical analysis based on the wave-beam negative refraction law. Thus, extensive applications of such a phenomenon to acoustic devices are anticipated.
2 More- Received 5 September 2004
DOI:https://doi.org/10.1103/PhysRevB.71.054302
©2005 American Physical Society