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A new stochastic differential equation approach for waves in a random medium

机译:一种新的随机微分方程方法   介质

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摘要

We present a mathematical approach that simplifies the theoretical treatmentof electromagnetic localization in random media and leads to closed formanalytical solutions. Starting with the assumption that the dielectricpermittivity of the medium has delta-correlated spatial fluctuations, and usingthe Ito lemma, we derive a linear stochastic differential equation for a onedimensional random medium. The equation leads to localized wave solutions. Thelocalized wave solutions have a localization length that scales inversely withthe square of the frequency of the wave in the low frequency regime, whereas inthe high frequency regime, this length varies inversely with the frequency tothe power of two thirds.
机译:我们提出了一种数学方法,可简化对随机介质中电磁局部化的理论处理,并导致封闭的形式解析解。从假设介质的介电常数具有与增量相关的空间波动的假设开始,并使用伊藤引理,我们推导出一维随机介质的线性随机微分方程。该方程导致局部波动解。本地化波解的定位长度在低频状态下与波频率的平方成反比,而在高频状态下,该长度与频率成反比,变化至三分之二的幂。

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