论文标题
二维电子系统中的边缘衍射和等离子体发射
Edge diffraction and plasmon launching in two-dimensional electron systems
论文作者
论文摘要
在侧面不hom基因上的光的衍射是纳米级现象的近场研究中的一个中心过程，尤其是表面波的传播。由于平面波方法的崩溃，该过程的理论描述极具挑战性。在这里，我们介绍并分析了具有不同表面电导率的二维电子系统（2DE）之间线性连接处电磁波衍射的精确解决方案。连接处的场是三个具有不同空间结构的组件的组合：自由场成分，非谐波边缘成分和表面等离子体 - 波利顿（SPP）。我们发现，通过边缘的光子到播种效率的闭合形式表达式是SPP和入射波中电场的比率。特别是，对于具有较大阻抗的金属和2DE之间的接触，转化效率可能会大大超过统一。我们的发现可以被视为迈向不均匀系统和极化干涉仪的定量近场显微镜的第一步。
Diffraction of light at lateral inhomogenities is a central process in the near-field studies of nanoscale phenomena, especially the propagation of surface waves. Theoretical description of this process is extremely challenging due to breakdown of plane-wave methods. Here, we present and analyze an exact solution for electromagnetic wave diffraction at the linear junction between two-dimensional electron systems (2DES) with dissimilar surface conductivities. The field at the junction is a combination of three components with different spatial structure: free-field component, non-resonant edge component, and surface plasmon-polariton (SPP). We find closed-form expressions for efficiency of photon-to-plasmon conversion by the edge being the ratio of electric fields in SPP and incident wave. Particularly, the conversion efficiency can considerably exceed unity for the contact between metal and 2DES with large impedance. Our findings can be considered as a first step toward quantitative near-field microscopy of inhomogeneous systems and polaritonic interferometry.
