Polariton waves in nonlinear dielectric medium

TL;DR

This paper theoretically investigates phonon-polariton spectra in nonlinear dielectrics, revealing new spectrum branches caused by third-order nonlinearity and proposing optical logic gates based on polariton excitations.

Contribution

It introduces a theoretical model for phonon-polariton spectra in nonlinear dielectrics with third-order nonlinearity and demonstrates potential applications in all-optical logic gates.

Findings

New polariton spectrum branches appear in the gap due to nonlinearity.

Soliton and cnoidal wave solutions are derived for these branches.

Optical OR and NOT gates are proposed based on polariton excitations.

Abstract

The phonon-polariton spectrum in dielectric medium with the third order nonlinearity was theoretically obtained. Dependence of number of polariton spectrum branches on intensity of electromagnetic field was investigated. The appearance of new branches located in the polariton spectrum gap was caused by the influence of dispersion of the third order dielectric susceptibility at increment of the field intensity in the medium. The soliton and cnoidal wave solutions for the polariton excitations for these new spectrum branches were obtained. The all-optical logic gates OR and NOT are proposed as an example of the theory application.