具有高度敏感拓扑演化的等离子体自旋梅隆晶格
Plasmonic Spin Meron Lattices with Height-Sensitive Topology Evolution
AI总结：
通过圆极化照明控制金属正方形耦合结构上方等离子体自旋梅隆晶格的拓扑切换，揭示高度敏感的拓扑演化机制。
摘要：
我们展示了一种在金属正方形耦合结构上方，通过圆极化照明控制等离子体自旋梅隆晶格的拓扑切换。在界面附近，倏逝表面等离子体极化子（SPP）通道产生一种类似于奈尔型的梅隆晶格，具有±1/2的有效站点电荷。在更大的高度处，来自正方形边缘的衍射场主导，将晶格转换为布洛赫型配置。在中间高度范围内，倏逝SPP与边缘衍射之间的过渡导致丰富的快速拓扑演化。切换过程中伴随着平面内自旋相位中边界外涡旋-反涡旋对的成核，产生高度依赖的分数站点电荷。我们的发现通过线性叠加SPP在等离子体区域中的公式化以及Stratton-Chu模型在衍射区域中的公式化，并通过全波有限差分时域模拟得到验证。
英文摘要：
We demonstrate height-controlled topological switching of plasmonic spin meron lattices above a metallic square coupling structure under circularly polarized illumination. Near the interface, an evanescent surface plasmon polariton (SPP) channel yields a Néel-type meron lattice with $\pm\frac{1}{2}$ like effective site charges. At larger heights, diffracted fields from the square edges dominate and convert the lattice into a Bloch-type configuration. Over a range of intermediate heights, crossover between the evanescent SPP and edge diffraction gives rise to rich rapid topology evolutions. The switching is accompanied by nucleation of off-boundary vortex-anti vortex pairs in the in-plane spin phase, producing height-dependent fractional site charges. Our findings are analytically formulated by linear superposition of SPPs in the plasmonic regime and Stratton-Chu model in diffraction regime and confirmed via full-wave finite-difference time-domain simulations.
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