AI 中文总结
研究基于柱面波展开框架，通过引入度量优化磁偏置等离子体棒非互易散射，确定最大非互易性区域，揭示其源于模式激发与干涉，结果可为动态可调光学器件发展提供蓝图。
AI 中文摘要
在亚波长尺度上有效打破时间反演对称性仍然是先进电磁波操纵的一项关键挑战。本文提出了一个基于柱面波展开的严格分析框架，用于研究和优化磁偏置等离子体棒对横向电波的非互易散射。引入了一个直观的度量来量化通过旋光粒子中相反角动量方位模式简并的不对称提升来打破时间反演对称性。利用该度量，对工作频率、回旋频率和圆柱光学尺寸的多参数空间进行了全面映射，确定了最大非互易性的区域。详细的多极分解表明，这种极端行为源于局域电偶极子和磁偶极子模式的相位匹配不对称激发和干涉。从单个孤立的超原子到集体光子系统，优化后的圆柱被排列成周期性光栅。在斜入射下，几何不对称和磁模式分裂的结合使得超表面在由相反侧激发时以完全不同的方式传输光。本文的研究结果和设计原则为动态可调平面光学隔离器、定向收发器和先进波前路由器的发展提供了一个通用蓝图。
英文摘要
Efficiently breaking time-reversal symmetry at the subwavelength scale remains a cornerstone challenge for advanced electromagnetic wave manipulation. This work presents a rigorous analytical framework, based on cylindrical wave expansion, to investigate and optimize the nonreciprocal scattering of transverse electric waves by magnetically biased plasmonic rods. An intuitive metric is introduced to quantify the breaking of time-reversal symmetry via the asymmetric lifting of degeneracy between azimuthal modes of opposite angular momentum, hosted by the gyrotropic particles. Leveraging this metric, a comprehensive mapping of the multiparametric space of operational frequency, cyclotron frequency, and cylinder optical size isolates regimes of maximum nonreciprocity. A detailed multipolar decomposition reveals that this extreme behavior stems from the phase-matched asymmetric excitation and interference of localized electric and magnetic dipole modes. Moving from individual, isolated meta-atoms to collective photonic systems, the optimized cylinders are arranged into a periodic grating. Under oblique incidence, the combination of geometric asymmetry and magnetic mode splitting, forces the metasurface to transmit light in a totally different way when excited by opposite sides. The reported findings and design principles offer a versatile blueprint for the development of dynamically tunable flat-optics isolators, directional transceivers, and advanced wavefront routers.
