基于拓扑单向表面磁等离子体的宽带、鲁棒且可调谐分束器
Broadband, robust, and tunable beam splitter based on topological unidirectional surface magnetoplasmons
AI总结：
本文提出利用拓扑单向表面磁等离子体模耦合实现宽带、鲁棒且可调谐的分束器，克服传统设计缺陷，具有频率无关分束比和磁场调谐能力。
摘要：
分束器是集成微波和光子系统中至关重要的组件。然而，基于定向耦合或多模干涉的传统设计常常遭受背向散射、频率相关的分束比以及有限带宽等问题。为克服这些限制，本文提出一种新的物理机制，通过操控输入和输出波导处拓扑单向表面磁等离子体（USMP）的模耦合，实现宽带、鲁棒且可调谐的分束器。我们证明，该分束器不仅对障碍物表现出强鲁棒性，而且在几乎整个USMP频带上实现宽带宽，并具有任意可调且与频率无关的分束比。此外，通过调节外部磁场可主动调谐分束器的工作频带，同时保持其鲁棒和宽带特性。我们的结果拓展了分束器的研究前沿，并可能在集成光子器件和现代通信系统中具有潜在应用。
英文摘要：
Beam splitters are pivotal components in integrated microwave and photonic systems. However, conventional designs based on directional coupling or multi-mode interference often suffer from back scattering, frequency-dependent splitting ratios, and limited bandwidth. To overcome these limitations, here, we propose a new physical mechanism to achieve a broadband, robust, and tunable beam splitter by manipulating the mode coupling of the topological unidirectional surface magnetoplasmons (USMP) at the input and output waveguides. We show that the beam splitter not only exhibits strong robustness against obstacles but also achieves a broad bandwidth across nearly the entire USMP band with arbitrarily tunable and frequency-independent splitting ratios. Moreover, the operating band of the beam splitter can be actively tuned by adjusting the external magnetic field, while its robust and broadband characteristics are retained. Our results extend the research frontier of beam splitters and may have potential applications in integrated photonic devices and modern communication systems.
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