title: Polariton spectrum in nonlinear dielectric medium.
abstract: We obtain theoretically the phonon-polariton spectrum in nonlinear dielectric medium with the third-order Kerr-type nonlinearity. We investigate the dependence of number of the polariton spectrum branches on the intensity of electromagnetic field and demonstrate that the appearance of new branches located in the polariton spectrum gap is caused by the influence of dispersion of the third-order dielectric susceptibility at the intensive electromagnetic field in the medium. The modulation instability of new spectrum branch waves leads to the appearance of the cnoidal waves or solitons. These new nonlinear waves one can use for designing optical devices such as the nonlinear optical filter converter.
authors.affiliation: Taurida National V. I. Vernadsky University, 4, Vernadsky Avenue, Simferopol 95007, Ukraine. dzedolik@crimea.edu
authors.forename: Igor V
authors.initials: IV
authors.lastname: Dzedolik
authors.forename: Olga
authors.initials: O
authors.lastname: Karakchieva