Size dependent local field enhancement factor of CdSe based core@shell spherical nanoparticles

Abstract We investigated the size dependent local field enhancement factor (LFEF) of CdSe@Ag and CdSe@ZnSe@Ag core/shell spherical nanoparticles theoretically numerically within framework quasi-static approximation. From potential distributions in core, shell(s), host medium, using modified Drude-Sommerfeld model, we separately obtained expressions for LFEF core/spacer/shell nanocomposites. By changing sizes each components nanocomposites these expressions, found that increases with a decrease core. At same time, resonance peaks are red shifted inner interface blue outer shell. The result also reveals whether shell radius is kept constant or decreased, increasing core produces lower showing crucial parameter to change dielectric metal nanoparticle (NP). When spacer (ZnSe) placed between (CdSe) (Ag), increased increase which was not observed case two layered having sizes. placing varying spacer, show different effects on nanocomposite. possibility obtaining by adjusting makes attractive applications nonlinear optics, photocatalysis, optoelectronics.