Ji Zitao, Lin Hao, Chen Jianfeng, Zheng Yidong, Li Zhi-Yuan
Opt Express. 2023 Nov 6;31(23):39121-39139. doi: 10.1364/OE.503901.
The magneto-optical (MO) materials are essential for designing nonreciprocal devices, like isolators and circulators. Even though the study of MO effect has a long history, the recent works of fabricating nonreciprocal nanostructures, novel MO metamaterials, and topological photonics have garnered significant attention in both theoretical and experimental research of MO materials. In this work, we consider the planar MO waveguide mode. By setting the general form of the fields and utilizing the boundary conditions, the analytical solution of MO modes is obtained. We have shown the potential of such effective solution in analyzing the dispersions and transport behaviors of MO modes in the waveguide. Crossings and avoided crossings of modes will happen, which may due to the strong coupling of TE and TM modes in the waveguide. Faraday rotation can be observed during the propagation of MO modes and the energy flow will precess in the waveguide. These results can be applied in predicting the evolution of the modes in MO waveguides, which has potential in designing MO nonreciprocal devices.
磁光（MO）材料对于设计诸如隔离器和环行器等非互易器件至关重要。尽管对磁光效应的研究历史悠久，但近期关于制造非互易纳米结构、新型磁光超材料和拓扑光子学的工作在磁光材料的理论和实验研究中都引起了极大关注。在这项工作中，我们考虑平面磁光波导模式。通过设定场的一般形式并利用边界条件，获得了磁光模式的解析解。我们展示了这种有效解在分析波导中磁光模式的色散和传输行为方面的潜力。模式的交叉和避免交叉将会发生，这可能是由于波导中TE和TM模式的强耦合所致。在磁光模式传播过程中可以观察到法拉第旋转，并且能量流将在波导中进动。这些结果可用于预测磁光波导中模式的演化，这在设计磁光非互易器件方面具有潜力。
