161 research outputs found
Numerical simulation of electromagnetic wave scattering from planar dielectric films deposited on rough perfectly conducting substrates
Electromagnetic wave scattering from planar dielectric films deposited on
one-dimensional, randomly rough, perfectly conducting substrates is studied by
numerical simulations for both p- and s-polarization. The reduced Rayleigh
equation, which is the integral equation satisfied by the scattering amplitude
after eliminating the fields inside the film, is the starting point for the
simulation. This equation is solved numerically by considering a random surface
of finite length, and by introducing wave number cut-offs in the evanescent
part of the spectrum. Upon discretization, a system of linear equations is
obtained, and by solving this matrix system for an ensemble of surface
realizations, the contribution to the mean differential reflection coefficient
from the incoherently scattered field, (\nu=p,s), is obtained nonperturbatively. It is demonstrated
that when the scattering geometry supports at least two guided waves,
, has, in addition to the well known
enhanced backscattering peak, well-defined satellite peaks in agreement with
theory, for most of the parameters considered.Comment: 11 pages and 11 figure
Phase randomness in a one-dimensional disordered absorbing medium
Analytical study of the distribution of phase of the transmission coefficient
through 1D disordered absorbing system is presented. The phase is shown to obey
approximately Gaussian distribution. An explicit expression for the variance is
obtained, which shows that absorption suppresses the fluctuations of the phase.
The applicability of the random phase approximation is discussed.Comment: submitted to Phys.Rev.
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