Weak localization of electromagnetic waves by densely packed many-particle groups: Exact 3D results

We use the superposition T-matrix method to solve the Maxwell equations and compute electromagnetic scattering characteristics of a 3D volume filled with densely packed, randomly distributed, wavelength-sized spherical particles. Our numerically exact data provide, for the first time, a direct demonstration of the onset and evolution of coherent backscattering with increasing number of particles and prove unequivocally that weak localization of electromagnetic waves can survive even in densely packed particulate media.