论文标题
狄拉克锥和软带中弹性波的手性选择
Dirac cones and chiral selection of elastic waves in a soft strip
论文作者
论文摘要
我们研究了柔软的细条中平面内弹性波的传播。我们期望展示类似狄拉克的锥体的特定几何和机械混合框架。我们将低频引导模式分开（通常为宽度宽度为100 Hz），并通过实验获得完整的分散图。狄拉克锥与其他显着波现象（例如负波速度或伪零组速度（ZGV））一起证明。对于Neumann和Dirichlet边界条件的模型（和数值模拟），我们的测量得到了令人信服的支持。最后，我们通过仔细设置源位置和极化来执行单向手性选择。因此，我们表明，软材料支持非典型的基于波浪的现象，这在它们制造大多数生物组织时就更加有趣。
We study the propagation of in-plane elastic waves in a soft thin strip; a specific geometrical and mechanical hybrid framework which we expect to exhibit Dirac-like cone. We separate the low frequencies guided modes (typically 100 Hz for a centimetre wide strip) and obtain experimentally the full dispersion diagram. Dirac cones are evidenced together with other remarkable wave phenomena such as negative wave velocity or pseudo-zero group velocity (ZGV). Our measurements are convincingly supported by a model (and numerical simulation) for both Neumann and Dirichlet boundary conditions. Finally, we perform one-way chiral selection by carefully setting the source position and polarization. Therefore, we show that soft materials support atypical wave-based phenomena, which is all the more interesting as they make most of the biological tissues.
