Rigorous solution for optical diffraction of a sub-wavelength real-metal slit

被引：11
|
作者：
Gravel, Yann [1 ]
Sheng, Yunlong [1 ]
机构：
[1] Univ Laval, Ctr Opt Photon & Laser, Quebec City, PQ G1K 7P4, Canada
来源：
OPTICS EXPRESS | 2012年 / 20卷 / 03期
关键词：
EVANESCENT-WAVE MODEL; SURFACE-PLASMONS; HOLE ARRAYS; TRANSMISSION; EARTH;
D O I：
10.1364/OE.20.002149
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We present a rigorous closed-form solution of the Sommerfeld integral for the optical scattering of a metal sub-wavelength slit. The two-dimensional (2D) field solution consists of the Surface Plasmon Polariton (SPP) mode at the metal surface and the 2D scattered field, which is the cylindrical harmonic of first order emitted by the electrical dipole and convolved with the 1D transient SPP along the interface. The creeping wave or quasi-cylindrical wave detected in the previous experiment is not an extra evanescent surface wave, but is the asymptotic behavior of the 2D scattered field at the proximity of the slit. Furthermore, our solution predicts a strong resonant enhancement of the scattered field at the proximity of the slit, depending on the materials and wavelength. (C)2012 Optical Society of America
引用
收藏
页码：2149 / 2162
页数：14
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