论文标题
倾斜线性交叉的超材料中高K模式的异常波传播
Abnormal wave propagation of high-k modes in tilted linear-crossing metamaterials
论文作者
论文摘要
在这项工作中，我们将光轴的旋转视为一种新的自由度，并理论上提出了倾斜的线性交叉超材料（TLCMM）。具体而言，NLCMM和TLCMM的锥体分散在凝结物理学中分别与I型和II型Dirac锥的形状相同。在旋转光轴角以使其等于圆锥角时，我们发现该特殊的TLCMM具有III型狄拉克锥的形状。这种关键的TLCMM可以具有许多独特的特性，并且与相邻阶段具有根本不同的性质。当带有大波矢量的EM波被带到具有开放式IFC到可用空间的超材料时，由于波形不匹配，入射EM波会强烈反映。在这里，我们使用边界条件和因果关系法来揭示TLCMM High-K模式可以在不反射和过滤的情况下实现异常折射。此外，这些现象在基于平面电路的系统中实验观察到。基于电路的TLCMM不仅为超材料中可靠的负负折射现象提供了多功能平台，而且还具有易于集成的平面结构。我们关于操纵EM波的结果可能使它们能够在平面集成的光子学中使用，包括用于定向繁殖，掩盖和开关。
In this work, we treat the rotation of the optical axis as a new degree of freedom and theoretically propose a tilted linear-crossing metamaterials (TLCMM). Specifically, the conical dispersions of the NLCMM and TLCMM have the same shapes as type-I and type-II Dirac cones, respectively, in condensed matter physics. Upon rotating the optical axis angle such that it is equal to the cone angle, we find that this special TLCMM has the shape of a type-III Dirac cone. This critical TLCMM can have many unique properties and is of a fundamentally different nature than neighboring phases. When EM waves with large wave vectors are incident to a metamaterial with an open IFC to free space, the incident EM wave is strongly reflected due to wave-vector mismatch. Here, we use boundary conditions and the causality law to reveal that TLCMM high-k modes can achieve abnormal refraction without reflection and filtering. Moreover, these phenomenon are observed experimentally in a planar circuit-based system. The circuit-based TLCMM not only provides a versatile platform for the study of robust negative refraction phenomena in metamaterials, but also has a planar structure that is easier to integrate. Our results regarding the manipulation of EM waves may enable their use in planar-integrated photonics including for directional propagation, cloaking, and switching.
