Upwind exciton-polariton propagation in hybrid photonic crystals
  In this work we study theoretically the axial spectral asymmetry of a 1D periodic multilayer systems composed by hybrid two-layers (isotropic/anisotropic) and for photon energies close to the electronic energy gaps of semiconductors (excitons). The non-normal optical properties of these resonant non-magnetic photonic crystals, where linear and quadratic spatial dispersion effects are both present, will be computed in the framework of exciton-polariton by self-consistent Maxwell-Schroedinger equation solutions in the effective mass approximation. The tailoring of hybrid crystal, where exciton-polariton unidirectional oblique propagation is observed, will be computed by implementing a simple two-layers minimum model. 
Andrea D'Andrea and Norberto Tomassini
cond-mat.mes-hall