| 标量衍射宽角度近场近似与方孔衍射的数值模拟算法 |
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| 引用本文： | 林继成,何龙庆.标量衍射宽角度近场近似与方孔衍射的数值模拟算法[J].安庆师范学院学报(自然科学版),2008,14(4). |
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| 作者姓名： | 林继成 何龙庆 |
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| 作者单位： | 南京晓庄学院物理与电子工程学院.江苏南京,210017;南京晓庄学院物理与电子工程学院.江苏南京,210017 |
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| 基金项目： | 江苏省教育厅自然科学基金
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| 摘 要： | 菲涅耳近似本质上是旁轴近似,当离轴的观察点距离衍射屏非常近时,菲涅耳近似引入的误差通常是不可忽视的。基于围绕坐标原点到场点的距离进行泰勒展开的近似方法,能有效地用于计算宽角度近场衍射,MATLAB仿真给出了清晰直观的结果。
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| 关 键 词： | 光学 标量衍射 宽角度近场近似 数值模拟 |
Wide-Angle Near Field Approximation for Scalar Diffraction and Numerical Simulation |
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| LIN Ji-cheng,HE Long-qing.Wide-Angle Near Field Approximation for Scalar Diffraction and Numerical Simulation[J].Journal of Anqing Teachers College(Natural Science Edition),2008,14(4). |
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| Authors: | LIN Ji-cheng HE Long-qing |
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| Institution: | LIN Ji-cheng,HE Long-qing(School of Physics , Electronic Engineering,Nanjing Xiaozhuang University,Nanjing 210017,China) |
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| Abstract: | The Fresnel diffraction is substantially a paraxial approximation.It yields nonnegligible errors when the distance of an abaxial point on the output plane from the aperture is very small.In this paper,a new method of approximation is introduced.The approximation is valid in the near field and at wide angles.Two algorithms of numerical calculations for rectangle aperture diffraction are presented,and corresponding MATLAB programs and simulations are given. |
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| Keywords: | optics scalar diffraction wide-angle near field approximations Numerical simulation |
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