Optical properties of polaritons in excitonic layers in symmetric and asymmetric dielectric environment

摘要

Polaritonic excitations in a layer with strong excitonic response are theoretically studied. The dielectric function of the layer is assumed in the Lorentzian form with only one excitonic pole taken into account. The dispersion as well as optical absorption spectra of polaritonic excitations in such a layer are calculated. Both cases of symmetric and asymmetric dielectric environment of the excitonic layer are considered. Special attention is paid to so-called slow radiative polaritons excited in the total reflection regime. The problem of the impact of the higher polariton modes on optical spectra of the excitonic layer is addressed for the first time.