Light Scattering by Rough Surfaces Full Wave Solutions.
Contractor rept. Sep 85-Feb 86,
E Z FULL WAVE ASSOCIATES LINCOLN NE
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Scattering of electromagnetic waves in media consisting of random distributions of particles such as atmospheric aerosols, smoke and dust has been investigated extensively using the equation of transfer. The main difficulties in setting up the equation of transfer lies in the determination of the elements of the 4x4 phase scattering matrix and the extinction cross sections for the individual particles. Most of the work has been done for particles of idealized shapes such as spheres and cylinders. In many physical problems of interest, however, the individual scatterers are of irregular shapes such as flakes, spheres and cylinders with random rough surfaces. In this work the results derived for particles with idealized shapes spheres are modified to account for the random surface roughness of the particles. To this end the full wave approach is used to determine the rough surface contributions to the like and cross polarized scattering cross sections, and the elements of the phase scattering matrix are given in terms of the weighted sum of the Mie solutions and the diffuse scattering terms due to the particle surface roughness. The extinction cross sections are determined through a judicious use of the forward scattering theorem and the very perceptive observation that for the large scatterers compared to a wavelength the forward scattering shadow forming wave is the same for all surfaces which have the same shadowline.
- Electricity and Magnetism
- Radiofrequency Wave Propagation