Light diffusion and localization in 3D nonlinear disordered media

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dc.creatorConti, Claudio
dc.creatorAngelani, Luca
dc.creatorRuocco, Giancarlo
dc.date2006-07-21
dc.date2006-11-09
dc.date.accessioned2026-07-07T07:57:52Z
dc.date.available2026-07-07T07:57:52Z
dc.descriptionUsing a 3D Finite-Difference Time-Domain parallel code, we report on the linear and nonlinear propagation of light pulses in a disordered assembly of scatterers, whose spatial distribution is generated by a Molecular Dynamics code; refractive index dispersion is also taken into account. We calculate the static and dynamical diffusion constant of light, while considering a pulsed excitation. Our results are in quantitative agreement with reported experiments, also furnishing evidence of a non-exponential decay of the transmitted pulse in the linear regime and in the presence of localized modes. By using an high power excitation, we numerically demonstrate the ``modulational instability random laser'': at high peak input powers energy is transferred to localized states from the input pulse, via third-order nonlinearity and optical parametric amplification, and this process is signed by a power-dependent non-exponential time-decay of the transmitted pulse.
dc.description5 pages, 4 figures. Revised version with new figure 4 with localized states
dc.identifierhttps://arxiv.org/abs/cond-mat/0607534
dc.identifierhttp://arxiv.org/abs/cond-mat/0607534
dc.identifierPhys. Rev. A 75, 033812 (2007)
dc.identifierdoi:10.1103/PhysRevA.75.033812
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/127806
dc.subjectDisordered Systems and Neural Networks
dc.subjectSoft Condensed Matter
dc.subjectPattern Formation and Solitons
dc.subjectOptics
dc.titleLight diffusion and localization in 3D nonlinear disordered media
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