Ultrashort pulse propagation and the Anderson localization
  We investigate the dynamics of a 10 fs light pulse propagating in a random medium by the direct solution of the 3D Maxwell equations. Our approach employs molecular dynamics to generate a distribution of spherical scatterers and a parallel finite-difference time-domain code for the vectorial wave propagation. We calculate the disorder-averaged energy velocity and the decay time of the transmitted pulse Versus the localization length for an increasing refractive index. 
Silvia Gentilini, Andrea Fratalocchi, Luca Angelani, Giancarlo Ruocco,   Claudio Conti