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

Published online by Cambridge University Press:  01 February 2011

David W. Ward ,
Eric Statz ,
Nikolay Stoyanov  and
Keith A. Nelson
David W. Ward
Affiliation:
The Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Eric Statz
Affiliation:
The Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Nikolay Stoyanov
Affiliation:
The Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Keith A. Nelson
Affiliation:
The Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Abstract

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 784: Symposium C – Ferroelectric Thin Films XII , 2003 , C11.60
Copyright
Copyright © Materials Research Society 2004

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References

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