Sound focusing by flat acoustic lenses without negative refraction -: art. no. 054102
Sound focusing by flat acoustic lenses without negative refraction -: art. no. 054102
复制标题
DOI：
10.1063/1.1852719
复制
发表时间：
2005-01-31
影响因子：
4
通讯作者：
Sánchez-Dehesa, J
中科院分区：
文献类型：
--
作者：
Håkansson, A;Cervera, F;Sánchez-Dehesa, J
我们提出了实验实现的两个平面声透镜的反设计。透镜由限制在矩形区域内的铝圆柱体的非周期性晶格组成。它们也是通过结合多重散射理论和遗传算法的设计获得的。通过遗传算法优化圆柱体的位置，以在焦点处产生最大的声放大。透镜的焦点和尺寸都是任意选择的。我们的方法说明了在两个镜头的测量与铝圆柱2米长，有五个和九个层，分别。在焦点处获得高达6.4 dB的声音放大。实验压力模式和理论模拟之间的良好协议支持我们的设计工具。得出的结论是，平面声透镜的非周期性分布的散射体可以产生声聚焦，而不需要负折射，已被证明在周期性晶格的散射体的属性。(C)2005年美国物理学会。
We present the experimental realization of two flat acoustic lenses generated by inverse design. The lenses consist of aperiodic lattices of aluminum cylinders confined in a rectangular area. They were obtained by a design too] that combines multiple scattering theory and a genetic algorithm. The cylinders' positions are optimized by the genetic algorithm in order to produce maximum sound amplification at the focal point. Both the focus and the dimension of the lenses are arbitrarily chosen. Our approach is illustrated by measurements in two lenses fabricated with aluminum cylinders 2 m long and having five and nine layers, respectively. Sound amplification up to 6.4 dB is obtained at the focus. The excellent agreement found between experimental pressure patterns and theoretical simulations supports our tool of design. It is concluded that flat acoustic lenses made of aperiodic distribution of scatterers can produce sound focusing with no need of negative refraction, a property that has been demonstrated in periodic lattices of scatterers. (C) 2005 American Institute of Physics.