  We have developed a model in order to account for electron-vibrational
effects on absorption, luminescence of molecular aggregates and
exciton-polaritons in nanofibers. The model generalizes the mean-field
electron-vibrational theory developed by us earlier to the systems with spatial
symmetry, exciton luminescence and the exciton-polaritons with spatial
dispersion. The correspondence between manifestation of electron-vibrational
interaction in monomers, molecular aggregates and exciton-polariton dispersion
in nanofibers is obtained by introducing the aggregate line-shape functions in
terms of the monomer line-shape functions. With the same description of
material parameters we have calculated both the absorption and luminescence of
molecular aggregates and the exciton-polariton dispersion in nanofibers. We
apply the theory to experiment on fraction of a millimeter propagation of
Frenkel exciton polaritons in photoexcited organic nanofibers made of
thiacyanine dye.
