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首页> 外文期刊>Applied optics >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
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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

机译：利用体积积分方程分析和计算厚金属屏中亚波长孔径的光场的衍射

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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.
机译：通过使用三维体积积分方程，广义共轭残差法和快速傅里叶变换，对厚金属屏幕中光阑在光场中的衍射进行了数值分析。数值结果通过互易性和数值计算中使用的截断离散体积大小的结果的独立性进行了验证。通过数值获得厚屏幕中正方形，圆形和三角形孔径的近场和远场。在本研究中获得的一些数值结果与以前报道的实验结果一致。在孔的侧壁上激发的表面等离激元极化子可以解释孔的近场分布的基本特征。发现Bethe-Bouwkamp理论不足以解释实际金属屏幕中亚波长孔径附近的近场的基本特征。

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