POLARITON DISPERSION IN NOVEL NANOCOMPOSITE SUPERLATTICE SYSTEM

Abstract

In a series of works K. Navaneethakrishnan et al.[ Physica E 31, 209(2006)  have investigatedthe possibility of acoustic polaritons in a novel superlattice system consisting of piezoelectric materials. In the present work, Silver Nanoparticles is added to these dielectric superlattices systems (Ag-LiNbO3/Ag-LiTaO3). The behavior of the polariton dispersion as a function of filling factor of silver nanoparticles concentration are investigated systematically. The significance of the polariton modes are analysed. New modes on the polaritonic gap, where the propagation of electromagnetic wave is forbidden, are obtained in the system due to the presence of silver nanoparticles (NPs).