Acoustic far-field focusing effect for two-dimensional graded negative refractive-index sonic crystals

作者：Peng, Shasha; He, Zhaojian; Jia, Han; Zhang, Anqi; Qiu, Chunyin; Ke, Manzhu^*; Liu, Zhengyou

来源：Applied Physics Letters, 2010, 96(26): 263502.

DOI：10.1063/1.3457447

• acoustic focusing
• refractive index

Focusing effect is experimentally observed for acoustic plane wave normally incident onto a two-dimensional sonic crystal with gradient negative refractive index. The gradual refractive-index is achieved by gradual modification of the lattice spacing both along the transverse and longitudinal directions. It is found that the focal length is controllable by modulation of the lattice spacing. The experiment results are in excellent agreement with theoretical calculation by a multiple scattering theory method.

• 出版日期2010-6-28
• 单位武汉大学