Simulation of Phonon-Polariton Generation and Propagation in Ferroelectric LiNbO3 Crystals

Details Simulation of Phonon-Polariton Generation and Propagation in Ferroelectric LiNbO3 Crystals Simulation of Phonon-Polariton Generation and Propagation in Ferroelectric LiNbO3 Crystals

2004-01-07

arxiv.org/abs/cond-mat/0401091v1

in Engineered Porosity for Microphotonics and Plasmonics: MRS Symposium Proceedings, Vol. 762, edited by R. Wehrspohn et al (M

Physics

Condensed Matter

6 pages, 4 figures, presented at the Materials Research Society fall meeting, Boston, MA, 2003

Scientific paper

We simulate propagation of phonon-polaritons (admixtures of polar lattice vibrations and electromagnetic waves) in ferroelectric LiNbO3 with a model that consists of a spatially periodic array of harmonic oscillators coupled to THz electromagnetic waves through an electric dipole moment. We show that when this model is combined with the auxiliary differential equation method of finite difference time domain (FDTD) simulations, the salient features of phonon-polaritons may be illustrated. Further, we introduce second order nonlinear coupling to an optical field to demonstrate phonon-polariton generation by impulsive stimulated Raman scattering (ISRS). The phonon-polariton dispersion relation in bulk ferroelectric LiNbO3 is determined from simulation.

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