Electromagnetic scattering from very rough random surfaces and deep reflection gratings
Electromagnetic scattering from very rough random surfaces and deep reflection gratings
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DOI：
10.1364/josaa.6.000367
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发表时间：
1989-03
影响因子：
1.9
通讯作者：
J. Soto-Crespo;M. Nieto-Vesperinas
中科院分区：
文献类型：
--
作者：
J. Soto-Crespo;M. Nieto-Vesperinas
本文利用消光定理对深导体一维随机粗糙面和反射光栅的电磁波散射进行了理论研究。散射方程用数值方法求解（而不是用通常的分析方法求解，这种方法只对轻微的波纹有效）。这使我们能够获得一个详尽的收集结果的平均散射强度作为偏振和表面参数的函数。特别是，朗伯散射和增强后向散射的随机表面的预测。此外，基尔霍夫近似的有效性范围内建立的随机表面的相关长度是可比的或小于波长。关于光栅，概括的闪耀大角度的入射，大周期，和任意形状。最后，它表明，闪耀的反镜面阶光栅是在根随机表面的增强后向散射。
A theoretical study of electromagnetic wave scattering from deep perfectly conducting one-dimensional random rough surfaces and reflection gratings is performed by means of the extinction theorem. The scattering equations are solved numerically (instead of being solved by the usual analytical procedures, which are valid only for slight corrugations). This permits us to obtain an exhaustive collection of results for the mean scattered intensity as a function of polarization and surface parameters. In particular, Lambertian scattering and enhanced backscattering are predicted for random surfaces. Also, the range of validity of the Kirchhoff approximation is established for random surfaces whose correlation length is comparable with or smaller than the wavelength. Concerning gratings, generalizations of the blaze for large angles of incidence, large periods, and arbitrary shapes are obtained. Finally, it is shown that the blaze of the antispecular order for gratings is at the root of the enhanced backscattering for random surfaces.