Recent, progress in the use of ultrasonic experiments and Multiple Scattering Theory to investigate wave transport in three-dimensional phoneme crystals is summarized. Through appropriate choice of material properties, complete band gaps can be realized for acoustic or elastic waves in such structures. This has allowed us to demonstrate the tunnelling of ultrasound through the band gap and to explore the unexpected effect of absorption on evanescent waves in crystals. Wave propagation above the gap has also been investigated, where we have shown that anisotropy of the wave speeds leads to the focusing of ultrasound without the curved surfaces usually employed in lenses. These ultrasonic experiments and their interpretation using Multiple Scattering Theory illustrate the important contribution that the study of phononic crystals can make to learning about wave scattering and transport in ordered mesoscopic materials.
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机译：综述了使用超声实验和多种散射理论来研究三维音素晶体中波传输的进展。 Through appropriate choice of material properties, complete band gaps can be realized for acoustic or elastic waves in such structures.这使我们能够通过带隙来展示超声波的隧道，并探讨吸收对晶体中的吸收的意外效果。还研究了GAP上方的波传播，其中我们已经示出了波速的各向异性导致超声波的聚焦，而没有通常用于透镜中的弯曲表面。这些超声实验及其使用多种散射理论的解释说明了声子晶体的研究可以在有序介质材料中学习波浪散射和运输的重要贡献。
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