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The Characterization of the Random Surfaces by Speckles and the Properties of the Near-field Speckles

Author: LiuMan
Tutor: ChengChuanFu；XuZhiZhan
School: Shandong Normal University
Course: Optics
Keywords: Random surface Light scattering Near-field speckle
CLC: O436.2
Type: Master's thesis
Year: 2003
Downloads: 114
Quote: 0
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Abstract


A rough random surface statistical properties over the years much concern, this issue has important implications in materials such as the dynamics of the growth interface, generated by the large impact fracture surface, optical component design, and many other physical field . Recent years, with the rapid development of near-field optical microscopy, near-field optical research both in theory and in the experiment are given considerable progress, but the research is still in the exploratory stage of the characteristics of the near-field speckle. Random surface, light scattering outline the characteristics of near-field optical and near-field speckle calibration characteristics and surface theory, experiment and computer simulation studies. The text is divided into four chapters. Chapter random surface description and calibration methods, light scattering profile characteristics of its importance, the near-field optical and near-field scattering of meaning and characteristics of the near-field speckle reviewed. Chapter II of the average intensity of image speckles random surface height - height correlation function extraction method. In the theoretical analysis and experimental measurements, we used a variable aperture of the Fourier transform and the imaging system, the light intensity of the image plane from the obtained analytical expression, the establishment of the average light intensity with the aperture value change between positive inverse Fourier transform right, thereby restoring the surface height - height correlation function. In experimental measurement related to three Gaussian random surface samples, for example, line the validation of the method. The measured results in line with the results measured by atomic force microscopy. Chapter Kirchhoff approximation theory of light scattering, random surface parameters extracted from the the random surface diffraction area near speckle field correlation function. We first draw a quantitative expression of the speckle correlation function, the type that speckle correlation function is actually equivalent in Van Cittert-Zernike theorem to the scattering profile function inversion results as a function of the scattering aperture scatterer plane . The method of using the minimum variance fit speckle correlation function of a measurement result with the expression obtained by fitting the parameters can be extracted from random surfaces. Through simulation, and a self-affine fractal random surface near the speckle intensity correlation function numerical calculation, for example, verify the theory and methods. The parameters of the three surface roughness w, cross-correlation length ξ and the roughness index value of α is consistent with the set value preferably. In the fourth chapter, we propose the concept of near-field speckle, based on the dielectric interface of electromagnetic waves the Green integral Summary equation and the numerical simulation of self-affine fractal random surfaces generated speckle light field research found that the near-field scattered spot fractal characteristics and the characteristics of self-affine fractal random surfaces and fractal characteristics disappear in the near-field region. A of speckle characteristics and its contrast with the distance of the surface parameters and leave the surface of the medium's evolution. Integral equations of the electromagnetic field and the midpoint of the traditional theory of diffraction extended function analogy, we have given a preliminary qualitative interpretation of the near-field speckle characteristics.

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CLC: > Mathematical sciences and chemical > Physics > Optics > Physical optics ( wave optics ) > Absorption and scattering
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