Hibbins Alastair P, Hooper Ian R, Lockyear Matthew J, Sambles J Roy
Electromagnetic Materials Group, School of Physics, University of Exeter, Exeter EX4 4QL, UK.
Phys Rev Lett. 2006 Jun 30;96(25):257402. doi: 10.1103/PhysRevLett.96.257402. Epub 2006 Jun 27.
An array of subwavelength slits in a metallic substrate supports a series of Fabry-Perot-like resonances, where each harmonic results in a transmission peak. Addition of extra slits per period yields a compound grating with a structure factor associated with the basis. In this study each repeat period is comprised of a central slit flanked by a pair of narrower slits. It supports three resonances for every Fabry-Perot-like solution. New and useful insight into this phenomenon is gained by describing each of the modes in terms of the band structure of diffractively coupled surface waves.
金属基底中的一系列亚波长狭缝支持一系列类似法布里 - 珀罗的共振，其中每个谐波都会产生一个透射峰。每个周期增加额外的狭缝会产生一个具有与基元相关的结构因子的复合光栅。在本研究中，每个重复周期由一个位于中心的狭缝和两侧的一对较窄狭缝组成。对于每个类似法布里 - 珀罗的解，它支持三种共振。通过根据衍射耦合表面波的能带结构来描述每种模式，可以获得对这一现象的新的有用见解。
