Abstract
We examine the nature and the dispersion of new polariton modes, which appear in thepolariton gap (i.e. within the Rabi splitting), considering the spectrum of polaritons in aplanar microcavity uniformly filled with a resonant material and exhibiting the strongexciton–photon coupling regime. These additional modes are the consequence of thequantization of the excitonic states caused by the confinement. We consider these in-gapmodes in materials typically used in microcavities and link the obtained results toexperiments, where such in-gap states have indeed been observed. We show that thesplitting between the in-gap modes and their bandwidth depend on the bandwidth of theexciton out of the microcavity and on the oscillator strength of the excitonic transition.
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