Defects in phononic crystals may induce localized states and therefore can serve as microcavities, waveguides, or perfect mirrors. In this article, we numerically and experimentally investigate the deformation behavior and wave propagation characteristics of a defected phononic crystal, which consists of a soft porous matrix and hard inclusions along with a line defect that is introduced designedly. Static and dynamic localized states appear due to the presence of the line defect. The results show that the soft phononic crystal with the line defect can control the guided waves by harnessing the uniaxial compression, which paves a new way to design tunable elastic waveguides.

中文翻译：

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具有线缺陷的软声子晶体中的可调谐导波

声子晶体中的缺陷可能会引起局部状态，因此可以用作微腔、波导或完美的镜子。在本文中，我们通过数值和实验研究了缺陷声子晶体的变形行为和波传播特性，该晶体由柔软的多孔基质和硬夹杂物以及专门引入的线缺陷组成。由于线缺陷的存在，出现静态和动态局部状态。结果表明，具有线缺陷的软声子晶体可以通过利用单轴压缩来控制导波，这为设计可调谐弹性波导开辟了新途径。