The Optical Response of Metallic Spherical Core-Shell Nanoparticles Fitriyadi (a*), Azrul Azwar (b), Fatimah Arofiati Noor (a)
a) Physics of Electronic Materials Research Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung 40132, Indonesia
*fitriyadi567[at]gmail.com
b) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Tanjungpura, Pontianak 78124, Indonesia
Abstract
The optical response of spherical nanoparticles was studied based on the quasi-static approximation of classical electrodynamics. The simple Drude model was used to calculate the complex dielectric function of the metal. We investigated the behavior of the absorption cross-section spectra of metallic spherical core-shell (including dielectric-metal and metal-dielectric) nanoparticles numerically. We found that the number of resonance peaks in the absorption cross-section spectra depends on the number of metal-dielectric interfaces of the nanostructure, as predicted by plasmonic hybridization theory. Furthermore, the absorption cross-section spectra can be precisely controlled by changing the thickness of the shell and the dielectric constant of the medium.
