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.
© 2013 Optical Society of America
Original Manuscript: December 20, 2012
Revised Manuscript: March 16, 2013
Manuscript Accepted: April 5, 2013
Published: April 29, 2013
Igor V. Dzedolik and Olga Karakchieva, "Polariton spectrum in nonlinear dielectric medium," Appl. Opt. 52, 3073-3078 (2013)