论文标题
对超材料的拓扑过渡的有效中等视角
Effective Medium Perspective on Topological Transitions in Metamaterials
论文作者
论文摘要
光子结构的许多特性依赖于带有整数不变的带拓扑结构，这些整数可能在拓扑转换过程中改变，并引起无序的拓扑边缘，角或界面状态。通常，这种结构的周期与波长相当。但是，在许多情况下，单位细胞变得深层波长，因此可以用有效的材料参数来描述整个超材料。在这里，着眼于次波长拓扑超材料，我们以具有$ d_6 $对称性的两个结构为例，确定了介绍性和渗透性的行为。
Many properties of photonic structures rely on band topology characterized by the integer invariants that can change during the topological transitions and give rise to the disorder-robust topological edge, corner, or interface states. Typically the periods of such structures are comparable to the wavelength. However, in many cases, the unit cell becomes deeply subwavelength and hence the entire metamaterial can be described in terms of the effective material parameters. Here, focusing on subwavelength topological metamaterials, we identify the behavior of permittivity and permeability accompanying the topological transition on the example of the two structures possessing $D_6$ symmetry.
