理论和数值研究了轴向均匀的三层波导系统中太赫兹表面等离子激元的单向传输行为, 三层系统由厚度为d的高介电常数介质层插入到低介电常数介质层和磁光半导体层中间组成。计算结果表明, 在外加磁场的作用下, 系统存在单向传输的频段。通过金属微米粒子的耦合及调节磁光半导体区域的磁场方向, 可以有效控制表面等离子体激元在三端口系统中的传播。

We theoretically and numerically demonstrate one-way action of terahertz surface plasmon polaritons in an axially uniform waveguide system that comprises of εhigh-dielectric layer of thickness d inset between a εlow-dielectric layer and magneto-optical semiconductor. The calculation shows that the system exist one-way action under an external magnetic field. The propagation of surface plasmon polaritons in a three ports system can be controlled by the coupling of micron size metal particles and the external magnetic fields.