基于太赫兹超表面的偏振无关表面等离子体涡旋发生器  

Polarization-Independent Surface Plasmon Polaritons Vortex Generator Based on Terahertz Metasurface

作　　者：孙博文 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海

出　　处：《建模与仿真》2023年第3期2851-2859,共9页Modeling and Simulation

摘　　要：为了解决近场表面等离子体(Surface plasmon polaritons, SPP)涡旋自旋绑定的问题,本文提出了一种基于几何和动力学相位结合的、控制太赫兹(THz)近场表面等离子体涡旋的超表面设计方法,通过调控超薄金薄膜中空气凹槽阵列的转向角和径向位置,来激发表面波并灵活地形成拓扑荷数不受自旋态影响的太赫兹表面等离子体涡旋场分布,从而解除了表面等离子体涡旋与自旋手性之间锁定的限制,并通过时域有限差分(FDTD)方法进行了数值仿真验证。该方法为调制太赫兹近场表面等离子体涡旋提供了前所未有的自由度,这将在太赫兹通信、集成系统中具有潜在的应用价值。In order to solve the spin-locking problem of near-field surface plasmon polaritons (SPP) vortices, a metasurface design method for terahertz (THz) near-field SPP vortices is proposed based on the combination of geometric and dynamic phases. By manipulating the orientation angle and radial position of the air slit array in the ultra-thin gold film, the excited surface waves are flexibly gener-ated and the topological charge of terahertz SPP vortex field is independent of the spin chirality. Thus, the limitation between the SPP vortex and the spin chirality is removed. The numerical simu-lation is carried out by using the finite difference time domain (FDTD) method. This design provides an unprecedented degree of freedom for modulating terahertz near-field SPP vortices, which will have potential applications in terahertz communication and integration systems.

关 键 词：表面等离子体 太赫兹通信 偏振无关 径向位置 自旋态 转向角 集成系统 超表面 

分 类 号：TN9[电子电信—信息与通信工程]