Influences of nonlinear interactions of polaritons in uniaxial crystals

摘要

We have analysed theoretically the polarization and dielectric constant of uniaxial ionic crystals, including theeffect of the nonlinear interactions between ions. The spectrum of polaritons (coupling modes of photons and opticalphonons) under nonlinear interactions was developed. A new branch of dispersion relations emerges in the originalfrequency gap.