Unified picture of polariton propagation in bulk GaAs semiconductors

High-resolution amplitude and phase linear spectroscopy of high-quality bul k GaAs are reported. The detailed structure of the observed full complex tr ansmission is consistently explained by polariton effects on the basis of m icroscopic calculations. The coupled equations for the excitonic polarizati on and the light field in the slab configuration are evaluated using approp riate boundary conditions for the electro-magnetic field and the excitonic wave function without reference to additional boundary conditions For the m acroscopic polarization.