拓扑单向表面磁等离子体激元中的鲁棒多模干涉与转换
Robust multimode interference and conversion in topological unidirectional surface magnetoplasmons
AI总结：
本文理论研究了YIG夹层波导中的拓扑单向表面磁等离子体激元，验证了磁可控多模干涉与模式转换，实现了可调分束器，为拓扑波操控提供了新自由度。
摘要：
我们理论研究了钇铁石榴石（YIG）夹层波导中的表面磁等离子体激元（SMPs）。色散关系表明，该波导能够支持拓扑单向SMPs。基于单向SMPs，在对称和非对称波导中均验证了磁可控的多模干涉（MMI）。由于沿两条YIG-空气界面的模式之间的耦合，非对称波导在单模频率范围内支持单向偶模。此外，当引入无序时，这些模式受到拓扑保护。利用鲁棒的单向SMPs多模干涉（USMMI），实现了可调分束器。研究表明，不同模式之间的模式转换可以实现。这些结果为操纵拓扑波提供了许多自由度。
英文摘要：
We have theoretically investigated surface magnetoplasmons (SMPs) in a yttrium-iron-garnet (YIG) sandwiched waveguide. The dispersion demonstated that this waveguide can support topological unidirectional SMPs. Based on unidirectional SMPs, magnetically controllable multimode interference (MMI) is verified in both symmetric and asymmetric waveguides. Due to the coupling between the modes along two YIG-air interfaces, the asymmetric waveguide supports a unidirectional even mode within a single-mode frequency range. Moreover, these modes are topological protected when disorder is introduced. Utilizing robust unidirectional SMPs MMI (USMMI), tunable splitters have been achieved. It has been demonstrated that mode conversion between different modes can be realized. These results provide many degrees of freedom to manipulate topological waves.
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