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.

© 2003 Optical Society of America

Influence of nanoscale cutoff in random self-affine fractal silver surfaces on the excitation of localized optical modes

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Reply to comment: Absolute measurement of roughness and lateral-correlation length of random surfaces by use of the simplified model of image-speckle contrast

Chuanfu Cheng, Chunxiang Liu, Ningyu Zhang, Tianqing Jia, Ruxin Li, and Zhizhan Xu
Appl. Opt. 42(14) 2523-2525 (2003)