Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1999-08-21
Phys.Rev. B62, 256-261 (2000)
Physics
Condensed Matter
Disordered Systems and Neural Networks
RevTex 6 pages, 3 figures in ps files
Scientific paper
10.1103/PhysRevB.62.256
The probability distribution of the reflection coefficient for light reflected from a one-dimensional random amplifying medium with {\it cross-correlated} spatial disorder in the real and the imaginary parts of the refractive index is derived using the method of invariant imbedding. The statistics of fluctuations have been obtained for both the correlated telegraph noise and the Gaussian white-noise models for the disorder. In both cases, an enhanced backscattering (super-reflection with reflection coefficient greater than unity) results because of coherent feedback due to Anderson localization and coherent amplification in the medium. The results show that the effect of randomness in the imaginary part of the refractive index on localization and super-reflection is qualitatively different.
Das Krishna E.
Kumar Nirman
Ramakrishna Anantha S.
Vijayagovindan G. V.
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