Instituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, CSIC-Universidad de Zaragoza, E-50009, Zaragoza, Spain.
Phys Rev Lett. 2010 Aug 13;105(7):073902. doi: 10.1103/PhysRevLett.105.073902. Epub 2010 Aug 11.
We present an analytical expression for the electromagnetic field at the surface radiated by a hole in a metal film. This expression is valid for any metal, from the optical range to longer wavelengths, and for distances to the hole larger than a few tens of nanometers. The field pattern presents a rich behavior, showing three regions (a complex short distance, an intermediate range dominated by surface plasmon polaritons, and a long-distance one dominated by Norton waves). The crossover distances between these regimes depend strongly on both the wavelength and the angle with respect to the incident field.
我们给出了金属膜孔辐射的电磁场的解析表达式。该表达式适用于从光学范围到更长波长的任何金属，以及距孔大于几十纳米的距离。场模式表现出丰富的行为，显示出三个区域（复杂的近距离、由表面等离激元极化激元主导的中间范围和由诺顿波主导的远距离）。这些区域之间的交叉距离强烈依赖于波长和相对于入射场的角度。
