Coherent backscattering enhancement in medium with variable refractive index

The paper addresses the problem of coherent backscattering enhancement in the refracting medium. Formulation of the problem on the basis of the radiative transfer theory for refracting media is derived. Results of numerical simulations for conservative Rayleigh slab medium reveal the moderate impact of the refraction on the shape of the coherent backscattering peak. For all the basic fundamental types of radiation sources (flat directed, point isotropic, point directed) asymptotic solutions of the radiative transfer equation in refracting medium are derived in the small angle approximation. Approximate solution for the wings of the coherent backscattering peak is presented.

► Weak localization in media with the graded refractive index has not yet been studied. ► Positive refraction gradient enhances transmission. ► The shape or peak in general is weakly influenced by the refraction. ► Derived SAA solution generalizes known SAA solutions to the case of flat layered refracting medium.