Huang Yuhao, Tang Gangchao, Li Zhi-Yuan, Liang WenYao
Opt Lett. 2023 Sep 1;48(17):4536-4539. doi: 10.1364/OL.500496.
We present mode conversion in different magneto-optical photonic crystal (MOPC) waveguides. An odd-mode waveguide (OMW) and an even-mode waveguide (EMW) are designed by adjusting the geometric parameters of the waveguide. These waveguides are constructed by adding a layer of yttrium-iron-garnet (YIG) rods with opposing magnetic fields between an MOPC and an AlO photonic crystal (PC). Due to the coupling effect caused by the middle layer of YIG rods, the OMW (or EMW) only supports an odd (or even) mode within a single-mode frequency range. Simulation results demonstrate that they can convert other modes into odd or even modes, and there is almost no power loss during the conversion. Most importantly, they are robust against backscattering from perfect electric conductors (PECs) and point defects. Based on these properties, we propose a device that can efficiently separate the odd and even modes into different ports. These results offer a novel approach to controlling the transmission modes of waveguides, which facilitates the interconnection of diverse topological magneto-optical waveguides.
我们展示了不同磁光光子晶体（MOPC）波导中的模式转换。通过调整波导的几何参数设计了一个奇模波导（OMW）和一个偶模波导（EMW）。这些波导是通过在MOPC和AlO光子晶体（PC）之间添加一层具有相反磁场的钇铁石榴石（YIG）棒来构建的。由于YIG棒中间层引起的耦合效应，OMW（或EMW）在单模频率范围内仅支持奇（或偶）模。仿真结果表明，它们可以将其他模式转换为奇模或偶模，并且在转换过程中几乎没有功率损耗。最重要的是，它们对来自理想电导体（PEC）和点缺陷的反向散射具有鲁棒性。基于这些特性，我们提出了一种可以将奇模和偶模有效分离到不同端口的器件。这些结果为控制波导的传输模式提供了一种新方法，这有利于各种拓扑磁光波导的互连。
