Maier Stefan A, Andrews Steve R, Martín-Moreno L, García-Vidal F J
Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom.
Phys Rev Lett. 2006 Oct 27;97(17):176805. doi: 10.1103/PhysRevLett.97.176805.
In this Letter, we show how the dispersion relation of surface plasmon polaritons (SPPs) propagating along a perfectly conducting wire can be tailored by corrugating its surface with a periodic array of radial grooves. In this way, highly localized SPPs can be sustained in the terahertz region of the electromagnetic spectrum. Importantly, the propagation characteristics of these spoof SPPs can be controlled by the surface geometry, opening the way to important applications such as energy concentration on cylindrical wires and superfocusing using conical structures.
在本信函中，我们展示了沿理想导线传播的表面等离激元极化激元（SPP）的色散关系如何通过用径向凹槽的周期性阵列使导线表面产生波纹来进行调整。通过这种方式，高度局域化的SPP可以在电磁频谱的太赫兹区域维持。重要的是，这些类表面等离激元极化激元（spoof SPP）的传播特性可以通过表面几何形状来控制，为诸如圆柱线上的能量集中以及使用锥形结构的超聚焦等重要应用开辟了道路。
