Using 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.
%0 Journal Article
%1 conti:033812
%A Conti, Claudio
%A Angelani, L.
%A Ruocco, G.
%D 2007
%I APS
%J Physical Review A
%K analysis; difference dynamics finite light localised method; molecular myown propagation; scattering; states time-domain transmission;
%N 3
%P 033812
%T Light diffusion and localization in three-dimensional nonlinear disordered media
%U http://link.aps.org/abstract/PRA/v75/e033812
%V 75
%X Using 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.
@article{conti:033812,
abstract = {Using 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.},
added-at = {2016-08-08T09:50:00.000+0200},
author = {Conti, Claudio and Angelani, L. and Ruocco, G.},
biburl = {https://www.bibsonomy.org/bibtex/2f6d3706481b998abd0549bc0a00a2259/nonlinearxwaves},
eid = {033812},
eprint = {http://arxiv.org/abs/cond-mat/0607534},
interhash = {5c082a006bd267004842ddbf76e5334d},
intrahash = {f6d3706481b998abd0549bc0a00a2259},
journal = {Physical Review A},
keywords = {analysis; difference dynamics finite light localised method; molecular myown propagation; scattering; states time-domain transmission;},
number = 3,
numpages = {5},
pages = 033812,
publisher = {APS},
timestamp = {2016-08-08T09:53:04.000+0200},
title = {Light diffusion and localization in three-dimensional nonlinear disordered media},
url = {http://link.aps.org/abstract/PRA/v75/e033812},
volume = 75,
year = 2007
}