声晶体对声束的空间滤波
Spatial Filtering of Sound Beams by Sonic Crystals
摘要：
我们提出并数值证明了一种有效的清洁声束的空间结构（空间滤波），通过传播它们通过至少二维的声波晶体，即通过声学结构周期性地调制在纵向和横向方向上的声音传播方向。我们展示了两种配置中的空间滤波：有和没有角带隙。我们还表明，除了空间滤波的光束可以另外聚焦在一个特定的距离后面的声波晶体在这两种配置。
英文摘要：
We propose and numerically demonstrate an efficient cleaning of spatial structure (spatial filtering) of sound beams by propagating them through at least twodimensional sonic crystals, i.e. through acoustic structures periodically modulated in longitudinal and in transversal direction with respect to the sound propagation direction. We show the spatial filtering in two configurations: with- and without the angular band-gap. We also show that besides the spatial filtering the beams can be additionally focalized at a particular distance behind the sonic crystal in both configurations.
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