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We cosider the elementary excitations in quantum wells of arbitrary shape, as they result from the coupling between excitons and electromagnetic radiation. The exciton states are obtained from a two-band model [1]. The solutions of Maxwell equations with the appropriate exciton dependent nonlocal susceptibility are obtained by using a mean field approach [2] based on the fact that the radiation wavelength Υ is much larger than the well width L. Application to asymmetric wells gives the polariton dispersion modes and the radiative linewidths for all possible well shapes. The splitting of the Z-mode and the values of the radiative lifetimes strongly depend on the well width L and its asymmetry. The reflectivity and absorption are computed and are shown to give strong evidence of polariton modes

Asymmetric quantum well optics from a mean field polariton theory