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

Chao Liu, Jingwei Lv, Famei Wang, Qiang Liu, Haiwei Mu, Tao Sun, Qiang Liu, Paul K. Chu
2015 NANO  
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
more » ... 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! À À i, j! þ À i, and j! À þ i modes red-shift with the refractive index of the surrounding medium and increase in the layer thickness causes either blue-shift or red-shift as shown by the extinction spectra. The mechanism of the red-shift or blue-shift is discussed. The j! À À i mode blue-shifts and furthermore, the j! À þ i and j! þ À i modes of the Ag coated multilayered nanostructure are noticeable by comparing the extinction e±ciency spectra of the Au-ITO-CdS-SiO 2 and Ag-ITO-CdS-SiO 2 multilayered nanoshells. * , †Corresponding authors.
doi:10.1142/s1793292015501179 fatcat:rh2lpfputbaltlntavoqhxbk6m