Coherence effects in light scattering of two-dimensional photonic disordered systems: Elastic scattering of cavity polaritons

Resonant scattering by cavity polaritons in a semiconductor microcavity is investigated. The bidimensional photonic behavior is well shown by the angu lar spread of the Rayleigh scattered light on the elastic cone. Moreover, t he strong coupling between the excitonic oscillator and the cavity mode ena bles the simultaneous observation of both (i) universal properties of disor dered systems such as coherent backscattering over a large angular width, a nd (ii) scattering anisotropy due to the microscopic nature of the scattere r.