Near-field speckles produced by random self-affine surfaces and their contrast transitions |
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Authors: | Cheng Chuanfu Liu Chunxiang Ren Xiaorong Liu Man Teng Shuyun Xu Zhizhan |
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Institution: | Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai, China. chengchuanfu@yahoo.com |
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Abstract: | By use of a numerical calculation based on Green's integral equation, we study the near-field speckles produced by the random self-affine fractal surfaces of a dielectric medium. The speckle intensities evolve considerably in the near-field region, and the local fluctuations in them disappear before they have traversed the distance of a wavelength. The transition of the speckle contrast either on the surface or in the near field and in the neighborhood non-near-field regions depends on lateral correlation length xi and roughness exponent alpha of the random surfaces. |
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