超声在三维声波晶体中的自准直
Self collimation of ultrasound in a 3D sonic crystal
摘要：
我们提出了自准直（亚衍射传播）的超声波束内的三维声波晶体的实验演示。该晶体由两个交叉的钢圆柱体结构形成，呈木桩状几何形状，置于水中。三维场分布的测量结果表明，一个狭窄的光束衍射传播的情况下的声波晶体是强烈的准直在晶体内的传播，展示了三维自准直效应。
英文摘要：
We present the experimental demonstration of self-collimation (subdiffractive propagation) of an ultrasonic beam inside a three-dimensional sonic crystal. The crystal is formed by two crossed steel cylinders structures in a woodpile-like geometry disposed in water. Measurements of the 3D field distribution show that a narrow beam which diffractively spreads in the absence of the sonic crystal is strongly collimated in propagation inside the crystal, demonstrating the 3D self-collimation effect.
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