title: In-gap polaritons in uniformly filled microcavities.
abstract: We examine the nature and the dispersion of new polariton modes, which appear in the polariton gap (i.e. within the Rabi splitting), considering the spectrum of polaritons in a planar microcavity uniformly filled with a resonant material and exhibiting the strong exciton-photon coupling regime. These additional modes are the consequence of the quantization of the excitonic states caused by the confinement. We consider these in-gap modes in materials typically used in microcavities and link the obtained results to experiments, where such in-gap states have indeed been observed. We show that the splitting between the in-gap modes and their bandwidth depend on the bandwidth of the exciton out of the microcavity and on the oscillator strength of the excitonic transition.
authors.affiliation: Institute of Spectroscopy RAS, Troitsk, Moscow Region, 142190, Russia.
authors.forename: M
authors.initials: M
authors.lastname: Litinskaya
authors.forename: V M
authors.initials: VM
authors.lastname: Agranovich