Analysis of Localized Surface Plasmon Resonance in Ag/ITO/CdS/SiO₂ Multilayered Nanostructured Composite

Abstract

Multilayered nanoshells have attracted much attention due to their unique optical, electronic and magnetic properties. In this work, numerical calculation using discrete dipole approximation (DDA) is conducted to investigate the quad-layered metal nanoshell consisting of a particle with a dielectric silica (SiO 2 ) core, inner cadium sul¯de (CdS) shell, middle indium tin oxide (ITO) shell and outer metal silver (Ag) shell. The phenomenon is interpreted by plasmon hybridization theory and the Ag-ITO-CdS-SiO 2 multilayered nanoshells are studied by extinction spectra of localized surface plasmon resonance. The variation in the spectrum peak with nanoparticle thickness and refractive index of the surrounding medium is derived. The electric¯eld enhancement contour around the nanoparticles under illumination is analyzed at the plasmon resonance wavelength. The j!