Coupled Topological Surface Modes in Gyrotropic Structures: Green's Function Analysis
Coupled Topological Surface Modes in Gyrotropic Structures: Green's Function Analysis
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DOI：
10.1109/lawp.2018.2859796
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发表时间：
2018-11-01
影响因子：
4.2
通讯作者：
Monticone, Francesco
中科院分区：
文献类型：
--
作者：
Gangaraj, S. Ali Hassani;Monticone, Francesco
在波导结构中的过渡处，入射能量的一部分被透射并且能量的一部分被反射。然而，当波导具有非平凡的拓扑性质时，过渡可能会发生，没有反向散射和不寻常的模式耦合/变换。在此背景下，我们讨论了由两个附近的相反偏置的gyrotropic介质和各向同性介质，支持单向表面模式（拓扑模式）之间的接口组成的非互易拓扑结构的响应。我们提供了一个精确的绿色的功能分析，这种结构，我们讨论了如何修改的拓扑表面模式时，两个接口被带到更接近，并最终合并。我们表明，由此产生的模式转换是独立的过渡几何形状。
At a transition in a wave-guiding structure, part of the incident energy is transmitted and part of the energy is reflected. When the waveguide has nontrivial topological properties, however, the transition may occur with no backscattering and with unusual modal coupling/transformations. Within this context, we discuss the response of a nonreciprocal topological structure composed of two nearby interfaces between oppositely biased gyrotropic media and an isotropic medium, which support unidirectional surface modes (topological modes). We provide an exact Green's function analysis of this structure, and we discuss how the topological surface modes are modified when the two interfaces are brought closer and eventually merged. We show that the resulting mode conversion is independent of the transition geometry.