کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8256936 1534268 2016 30 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Polarization effects for electromagnetic wave propagation in random media
ترجمه فارسی عنوان
اثرات قطبی شدن برای انتشار موج الکترومغناطیسی در رسانه های تصادفی
کلمات کلیدی
معادلات ماکسول، حمل و نقل شعاعی، رسانه های تصادفی، قطبش،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی
We study Maxwell's equations in random media with small fluctuations of the electric permittivity. We consider a setup where the waves propagate toward a preferred direction, called range. We decompose the electromagnetic wave field in transverse electric and transverse magnetic plane waves, called modes, with random amplitudes that model cumulative scattering effects in the medium. Their evolution in range is described by a coupled system of stochastic differential equations driven by the random fluctuations of the electric permittivity. We analyze the solution of this system with the Markov limit theorem and obtain a detailed asymptotic characterization of the electromagnetic wave field in the long range limit. In particular, we quantify the loss of coherence of the waves due to scattering by calculating the range scales (scattering mean free paths) on which the mean amplitudes of the modes decay. We also quantify the energy exchange between the modes, and consequently the loss of polarization induced by scattering, by analyzing the Wigner transform (energy density) of the electromagnetic wave field. This analysis involves the derivation of transport equations with polarization. We study in detail these equations and connect the results with the existing literature in radiative transport and paraxial wave propagation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Wave Motion - Volume 63, June 2016, Pages 179-208
نویسندگان
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