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Superlattices and Microstructures
Article . 1998 . Peer-reviewed
License: Elsevier TDM
Data sources: Crossref
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Coherently amplifying random medium: Statistics of super-reflection

Authors: Kumar, Narendra; Pradhan, Prabhakar; Jayannavar, AM;

Coherently amplifying random medium: Statistics of super-reflection

Abstract

Light-wave propagation in a randomly scattering but uniformly and coherently amplifying optical medium is analysed for the statistics of the coefficient of reflection r(l) that may now exceed unity, hence super-reflection. Uniform coherent amplification is introduced phenomenologically through a constant negative imaginary part added to the otherwise real dielectric constant of the medium, assumed random. The probability density p (r, I) for the reflection coefficient, calculated in a random phase approximation, tends to an asymptotic form p(r, infinity) having a long tail with divergent mean (r) in the limit of weak disorder but with the sample length I (measured in units of the localization length in the absence of gain) much greater than 1. This super-reflection is attributed to a synergetic effect of localization and coherent amplification, as distinct from the classically diffusive path-length prolongation. Our treatment is based on the invariant-imbedding method for the one-channel (single-mode) case, and is in the spirit of the scattering approach to wave transport as pioneered by Landauer. Generalization to the multichannel case is pointed out. Relevance to random lasers, and some recent results for a sub-meanfree path sample are also briefly discussed.

Country
India
Keywords

Physics, 535

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
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