Etude des concepts et applications des plasmoniques en nanophotonique

Abstract

A surface plasmon is an electromagnetic wave that propagates at the interface between a metal and a dielectric. This wave arises from the coupling between incident photons and free electrons near the interface. There are two types of surface plasmon the delocalized surface plasmon SPP that it is about longitudinal fluctuations of the density of surface electrons propagate along the dielectric-metal interface in a manner coupled with an evanescent electromagnetic wave , and the localized surface plasmon LSP which is a collective and coherent oscillation of the conduction electrons on the surface of a metallic particle of nanometric size under the action of an external field. Gold nanoparticles are known for the generation of this plasmonic effect for this we have studied the concept of surface plasmonic and its different applications such as nanophotonic, photovoltaics, and biphotonic for the detection of viruses such as COVID19.Using a simulation with OptiFDTD software, we have studied the influence of the size of the gold nanoparticle and its environment on the effect of plasmon resonance.