二维声波晶体中声波的极值透射和拍频效应
Extremal transmission and beating effect of acoustic wave in two-dimensional sonic crystal
摘要：
首次从实验上证明了二维声波晶体中狄拉克点附近的声波透射极值与样品厚度成反比。实验观察到声脉冲在二维超导平板中传输时的拍频效应。这种现象完全不同于平板或空腔中由界面反射或法布里-珀罗效应引起的波的振荡。它们可以看作是相对论电子Zitterbewegung的声学模拟，并分析了产生这种现象的物理根源。
英文摘要：
The extremal transmission of acoustic wave near the Dirac point in two-dimensional (2D) sonic crystal (SC), being inversely proportional to the thickness of sample, has been demonstrated experimentally for the first time. Some unusual beating effects have been observed experimentally when the acoustic pulse transport through the 2D SC slabs. Such phenomena are completely different from the oscillations of the wave in a slab or cavity originating from the interface reflection or Fabry-Perot effect. They can be regarded as acoustic analogue to Zitterbewegung of relativistic electron. The physical origination for the phenomenon has been analyzed.
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