Rayleigh scattering in coupled microcavities: Experiment
  We experimentally analyze Rayleigh scattering in coupled planar microcavities. We show that the correlations of the disorder in the two cavities lead to inter-branch scattering of polaritons, that would otherwise be forbidden by symmetry. These longitudinal correlations can be inferred from the strength of the inter-branch scattering. 
Z. V\"or\"os, P. Mai, M. Sassermann, G. Weihs, A.M. Andrews, H. Detz,   G. Strasser
cond-mat.str-el cond-mat.mes-hall