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Physical Optics Solution for the Scattering of a Partially-coherent Wave from a Statistically Rough Material Surface
Authors
Santasri Basu
Salvatore Cusumano
+3 more
Steven T. Fiorino
Milo W., IV Hyde
Mark F. Spencer
Publication date
25 March 2013
Publisher
AFIT Scholar
Abstract
The scattering of a partially-coherent wave from a statistically rough material surface is investigated via derivation of the scattered field cross-spectral density function. Two forms of the cross-spectral density are derived using the physical optics approximation. The first is applicable to smooth-to-moderately rough surfaces and is a complicated expression of source and surface parameters. Physical insight is gleaned from its analytical form and presented in this work. The second form of the cross-spectral density function is applicable to very rough surfaces and is remarkably physical. Its form is discussed at length and closed-form expressions are derived for the angular spectral degree of coherence and spectral density radii. Furthermore, it is found that, under certain circumstances, the cross-spectral density function maintains a Gaussian Schell-model form. This is consistent with published results applicable only in the paraxial regime. Lastly, the closed-form cross-spectral density functions derived here are rigorously validated with scatterometer measurements and full-wave electromagnetic and physical optics simulations. Good agreement is noted between the analytical predictions and the measured and simulated results. © 2013 Optical Society of Americ
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Last time updated on 02/01/2020
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info:doi/10.1364%2Foe.21.00680...
Last time updated on 26/04/2021