Janaszek Bartosz, Tyszka-Zawadzka Anna, Szczepański Paweł
Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa 75, 00-665 Warsaw, Poland.
National Institute of Telecommunications, 1 Szachowa, 04-894 Warsaw, Poland.
Materials (Basel). 2021 Nov 15;14(22):6885. doi: 10.3390/ma14226885.
In this work, we study the effect of spatial dispersion on propagation properties of planar waveguides with the core layer formed by hyperbolic metamaterial (HMM). In our case, the influence of spatial dispersion was controlled by changing the unit cell's dimensions. Our analysis revealed a number of new effects arising in the considered waveguides, which cannot be predicted with the help of local approximation, including mode degeneration (existence of additional branch of TE and TM modes), power flow inversion, propagation gap, and plasmonic-like modes characterized with long distance propagation. Additionally, for the first time we reported unusual characteristic points appearing for the TM mode of each order corresponding to a single waveguide width for which power flow tends to zero and mode stopping occurs.
在这项工作中，我们研究了空间色散对由双曲超材料（HMM）形成芯层的平面波导传播特性的影响。在我们的研究中，通过改变单元胞尺寸来控制空间色散的影响。我们的分析揭示了在所考虑的波导中出现的许多新效应，这些效应无法借助局部近似来预测，包括模式简并（TE和TM模式存在额外分支）、功率流反转、传播间隙以及具有长距离传播特征的类等离子体模式。此外，我们首次报道了对于每个对应于单个波导宽度的阶次的TM模式出现的异常特征点，此时功率流趋于零且发生模式截止。
