Wang Y Q, Hu H, Zhang Q, Gao D L, Gao L
Opt Express. 2020 Jul 20;28(15):21641-21649. doi: 10.1364/OE.397827.
The topological magnetoelectric effect is associated with the photonic spin-orbit interaction. However, due to the proportionate fine structure constant of the topological term, the topological magnetoelectric effect is usually weak. In this paper, we demonstrate that the axion term enables manipulation of the spin Hall shift of light around Fano resonance. And, the excited surface plasmon near the nanoparticle's interface could enhance the topological magnetoelectric effect for several orders. Numerical simulation of near field and far-field scattering confirms our theoretical results. Our work may pave the way to exploit the topological magnetoelectric effect in practical applications, such as optical sensing and nanoprobing.
拓扑磁电效应与光子自旋轨道相互作用相关。然而，由于拓扑项的精细结构常数成比例，拓扑磁电效应通常较弱。在本文中，我们证明轴子项能够操控法诺共振附近光的自旋霍尔位移。并且，纳米颗粒界面附近激发的表面等离子体激元可将拓扑磁电效应增强几个数量级。近场和远场散射的数值模拟证实了我们的理论结果。我们的工作可能为在光学传感和纳米探测等实际应用中利用拓扑磁电效应铺平道路。
