中国物理B ›› 2005, Vol. 14 ›› Issue (10): 1990-1995.doi: 10.1088/1009-1963/14/10/012
滕树云1, 刘曼1, 桂维玲1, 程传福2, 徐至展3
Teng Shu-Yun (滕树云)a, Cheng Chuan-Fu (程传福)ab, Liu Man (刘曼)a, Gui Wei-Ling (桂维玲)a, Xu Zhi-Zhan (徐至展)b
摘要: This paper studies the correlation properties of the speckles in the deep Fresnel diffraction region produced by the scattering of rough self-affine fractal surfaces. The autocorrelation function of the speckle intensities is formulated by the combination of the light scattering theory of Kirchhoff approximation and the principles of speckle statistics. We propose a method for extracting the three surface parameters, i.e.~the roughness w, the lateral correlation length \xi and the roughness exponent \alpha , from the autocorrelation functions of speckles. This method is verified by simulating the speckle intensities and calculating the speckle autocorrelation function. We also find the phenomenon that for rough surfaces with \alpha = 1, the structure of the speckles resembles that of the surface heights, which results from the effect of the peak and the valley parts of the surface, acting as micro-lenses converging and diverging the light waves.
中图分类号: (Speckle and moiré patterns)