INTERACTION OF EXCITON POLARITONS WITH THE SURFACE-POTENTIAL OF THIN SEMICONDUCTOR-FILMS - S-POLARIZATION GEOMETRY

The influence of the surface-potential shape on exciton optical spectr a for thin semiconductor films is investigated theoretically. Using a realistic model with both intrinsic and extrinsic contributions, we ca lculate the polarization vector and the electric field in the case of s-polarized incident light at one of the thin-film surfaces. Our analy tic results are employed to study the relation between the surface pot ential parameters and the spectra of reflectivity and transmissivity. The generation of near-surface localized excitons and their optical ma nifestation are also analyzed.