论文标题
通过跨面 - 边缘衍射激发不对称的表面波激发
Asymmetric surface wave excitation through metasurface-edge diffraction
论文作者
论文摘要
局部表面波模式的选择性激发仍然是泄漏波和边界设备设计的挑战。在这封信中，我们展示了元截面的截断如何在打破结构支持的表面波的激发时打破空间反演对称性。这是通过在分散关系中结合大型各向异性的结合，而边缘的存在也可以用作平面波激发与诱导的表面波之间的耦合机制。通过基于离散的Wiener-HOPF技术，通过诉诸散射问题的精确解，我们表明，通过将冲击波向量平行于截断的撞击向量的组成部分，激发了两个不同的表面波。
The selective excitation of localized surface wave modes remains a challenge in the design of both leaky-wave and bound-wave devices. In this Letter, we show how the truncation of a metasurface can play an important role in breaking the spatial inversion symmetry in the excitation of surface waves supported by the structure. This is done by combining a large anisotropy in the dispersion relation and the presence of an edge which also serves as a coupling mechanism between the plane wave excitation and the induced surface waves. By resorting to the exact solution of the scattering problem based on a discrete Wiener-Hopf technique we show that by inverting the component of the impinging wavevector parallel to the truncation, two distinct surface waves are excited.
