Kwiecien Pavel, Richter Ivan, Kuzmiak Vladimír, Čtyroký Jiří
J Opt Soc Am A Opt Image Sci Vis. 2017 Jun 1;34(6):892-903. doi: 10.1364/JOSAA.34.000892.
We have studied theoretically and numerically surface magnetoplasmons in three types of THz guiding structures, namely, InSb/dielectric planar boundary, InSb/air/metal planar waveguide, and symmetric InSb/air/InSb planar waveguide, in the presence of an external magnetic field. We consider the Voigt magneto-optic configuration in which these structures provide a frequency range where only one propagation direction is allowed to support one-way propagation of the surface plasmon polariton, due to nonreciprocity of the structures. To study the dispersion properties associated with unidirectional propagation of magnetoplasmons in finite-size nanostructured waveguides, we have developed an efficient two-dimensional numerical technique based on the magneto-optic aperiodic rigorous coupled-wave analysis. We have shown that the one-way bandwidth can be controlled by an external magnetic field and by the permittivity and thickness of the dielectric guiding layer. To enable numerical simulation, we have utilized the configuration in which the magnetized section of a waveguide is along the direction of propagation sandwiched by the identical waveguide segments without a magnetic field. We have also shown that the one-way bandwidth can be controlled by an external magnetic field and by the permittivity and thickness of the dielectric guiding layer.
我们在存在外部磁场的情况下，对三种太赫兹波导结构中的表面磁等离子体激元进行了理论和数值研究，这三种结构分别是：锑化铟/介质平面边界、锑化铟/空气/金属平面波导以及对称的锑化铟/空气/锑化铟平面波导。我们考虑了沃伊特磁光配置，在这种配置下，由于结构的非互易性，这些结构提供了一个频率范围，在该范围内只有一个传播方向能够支持表面等离激元极化激元的单向传播。为了研究有限尺寸纳米结构波导中与磁等离子体激元单向传播相关的色散特性，我们基于磁光非周期严格耦合波分析开发了一种高效的二维数值技术。我们已经表明，单向带宽可以通过外部磁场以及介质波导层的介电常数和厚度来控制。为了进行数值模拟，我们采用了这样一种配置，即波导的磁化部分沿着传播方向夹在没有磁场的相同波导段之间。我们还表明，单向带宽可以通过外部磁场以及介质波导层的介电常数和厚度来控制。
