LIGHT-SCATTERING FROM RANDOM ROUGH DIELECTRIC SURFACES

被引:155
作者
SANCHEZGIL, JA
NIETOVESPERINAS, M
机构
[1] Instituto de Optica, Consejo Superior de Investigaciones Científicas, Madrid, 28006
来源
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION | 1991年 / 8卷 / 08期
关键词
D O I
10.1364/JOSAA.8.001270
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A theoretical and numerical study is made of the scattering of light and other electromagnetic waves from rough surfaces separating vacuum from a dielectric. The extinction theorem, both above and below the surface, is used to obtain the boundary values of the field and its normal derivative. Then we calculate the angular distribution of the ensemble average of intensity of the reflected and transmitted fields. The scattering equations are solved numerically by generating one-dimensional surface profiles through a Monte Carlo method. The effect of roughness sigma and correlation distance T on the aforementioned angular distribution, as well as on the reflectance, is analyzed. Enhanced backscattering and new transmission effects are observed, also depending on the permittivity. The ratio sigma/T is large in all cases studied, and thus no analytical approximation, such as the Kirchhoff approximation (KA) and small perturbation methods, could a priori be expected to hold. We find, however, that the range of validity of the KA can be much broader than that previously found in perfect conductors.
引用
收藏
页码:1270 / 1286
页数:17
相关论文
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