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Near-field speckles produced by random self-affine surfaces and their contrast transitions

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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 ξ and roughness exponent α of the random surfaces.

© 2003 Optical Society of America

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