Investigations on Nonlinear Polariton Dispersion in Ferroelectric Superlattice System

Abstract

Superlattices have drawn considerable
attention in the recent years. In this work, the
behaviour of polaritons in a quantum well
superlattice system is analysed both at the
centre and at the edge of the brillouin zone
using LiNbO3/ LiTaO3 as an example. The
significance of the polariton modes are
analysed. New modes due to nonlinearity on the
polaritonic gap, where the propagation of
electromagnetic wave is forbidden, are obtained
in the system as suggested by some recent
literature. The variation of frequency with the
thickness is also studied.