An ordered array of silver (Ag) nanoparticles (NPs) on the uniaxial LiNbO3 material is theoretically analyzed under an extended Maxwell-Garnett (M-G) effective approximation to account on the anisotropic effects. Structural parameters such as NPs radius and interparticle distances in the array play a key-role in the evaluation of the dielectric response in both parallel and perpendicular directions. In fact, the negative epsilon (NE) condition is satisfied for specific values of the above parameters. This condition defines an interval of energies, called NE range. We compare these results to that obtained for a random distribution of Ag NPs embedded in LiNbO3 matrix.Keywords: Ferroelectric materials, metallic nanoparticles, extended Maxwell-Garnett theory
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