Modeling of stochastic absorption in a random medium

被引:11
作者
Joshi, SK
Sahoo, D
Jayannavar, AM
机构
[1] Inst Phys, Bhubaneswar 751005, Orissa, India
[2] Indira Gandhi Ctr Atom Res, Div Mat Sci, Kalpakkam 603102, Tamil Nadu, India
来源
PHYSICAL REVIEW B | 2000年 / 62卷 / 02期
关键词
D O I
10.1103/PhysRevB.62.880
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report a detailed and systematic study of wave propagation through a stochastic absorbing random medium. Stochastic absorption is modeled by introducing an attenuation constant per unit length a in the free propagation region of the one-dimensional disordered chain of delta-function scatterers. The average value of the logarithm of transmission coefficient decreases linearly with the length of the sample. The localization length is given by xi=xi(w)xi(alpha)/(xi(w)+ xi(alpha)), where xi(w) and xi(alpha) are the localization lengths in the presence of only disorder and of only absorption, respectively. Absorption does not introduce any additional reflection in the limit of large alpha, i.e., reflection shows a monotonic decrease with a and tends to zero in the limit of alpha-->infinity, in contrast to the behavior observed in case of coherent absorption. The stationary distribution of reflection coefficient agrees well with the analytical results obtained within random-phase approximation in a larger parameter space. We also emphasize the major differences between the results of stochastic and coherent absorption.
引用
收藏
页码:880 / 885
页数:6
相关论文
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