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Rigorous Theory Of Metallic And Dielectric Non Periodic Rough Surfaces And Its Numerical Implementation

We investigate the influence of the finite conductivity of metals on scattering from two dimensional rough surfaces. The particular case of a random rough surface illuminated with a laser beam is considered. With this aim, we have implemented a beam simulation method, in order to overcome the very difficult problem which occurs when the number of asperities illuminated by the laser beam is increased. A rigorous integral theory, very close to that implemented to diffraction gratings, has been used. Numerical results show the influence of the width and the height of the asperities on the absorption of light.