Size Dependent Local Field Enhancement Factor Of Cdse Based Core Triple Layer Spherical Nano Particles

Abstract

Nanoparticle is a general term in which nano refers to size and denotes a billionth of a unit. Since nanoparticles have been in use, they have become the cornerstones of nanoscience and nanotechnology. Their applications in the real world require spe cific sizes, shapes, compositions, and structures. Hence, this dissertation is devoted to the theoretical and numerical investigations of the effects of size, shape, surface plasmons, and host medium ontheoptical properties of core-shell nanocomposites (NCs). We reviewed on the size-dependent local field enhancement factor (LFEF) of CdSe@ZnSe@Ag core/spacer/shell spherical nanoparticles within the framework of quasi-static approximation was numerically and theoretically investigated. From the potential distributions in the core, shell(s), and host medium, and using the modi f ied Drude-Sommerfeld model, we separately obtained the expressions for LFEF of core/spacer/shell nanocomposites. By changing the sizes of each of the compo nents of the nanocomposites in these expressions, we understand that the LFEF of CdSe@ZnSe@Ag increases with a decrease in the size of the core. At the same time, theresonancepeaksareredshiftedintheinnerinterfaceandblueshiftedintheouter interface of the shell. The result also reveals that whether the shell radius is kept con stant or decreased, increasing the core size produces a lower field enhancement fac tor showingthatthecoresizeisacrucialparametertochangethefieldenhancement factor of the dielectric core and metal shell nanoparticle (NP). In general the sizes of the core, the spacer and the shell have vigorous effects on the local field enhance ment factor of core-shell nanoparticles. The feature direction of this study likely in volves experimental characterization and theoretical modeling to explore how the size variations of CdSe@ZnSe@Ag core triple-layer spherical nanoparticles influence their local fieldenhancementfactor,whichiscrucialimportancefortheirapplication in nanotechnology and photonics.