Analysis and numerical computation of diffraction of an optical field by a subwavelength-size aperture in a thick metallic screen by use of a volume integral equation

被引:16
作者
Tanaka, K [1 ]
Tanaka, M [1 ]
机构
[1] Gifu Univ, Dept Elect & Comp Engn, Gifu 5011193, Japan
关键词
D O I
10.1364/AO.43.001734
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Diffraction of an optical field by an aperture in a thick metallic screen is analyzed numerically by use of a three-dimensional volume integral equation together with a generalized conjugate residual method and fast Fourier transformation. Numerical results were validated by reciprocity and the independence of the results of the truncated discretized volume size used in numerical calculations. Near and far fields of square, circular, and triangular apertures in a thick screen are obtained numerically. Some of the numerical results obtained in the present study agree with previously reported experimental results. The surface plasmon polaritons excited on the sidewalls of the aperture can explain the basic characteristics of near-field distribution of apertures. The Bethe-Bouwkamp theory was found to be insufficient to explain the basic characteristics of the near field around the subwavelength aperture in a practical metallic screen. (C) 2004 Optical Society of America.
引用
收藏
页码:1734 / 1746
页数:13
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