Calculation Of Extinction Cross Section For Core- Shell Nanostructures Using COMSOL Multiphysics

Abstract

Using COMSOL Multiphysics software SiO₂@Pt and SiO₂@Cu spherical core shell were modeled. For both composite the radius of sphere was constant (60 nm) and the thickness of both shells were changed from 5 to 20 nm. The model was used to simulate wavelength dependent optical properties including absorption, scattering, and extinction cross sections. The resonance wavelength for absorption, scattering and extension cross section decreases with thickness increasing for both core shell structure.  All resonance wavelength values for SiO₂@Pt are less than that for SiO₂@Cu. Exact control over shell thickness modifies the kinetics of electromagnetic interactions at the nanoscale in addition to adjusting optical density.  The findings provide the way for future developments in nanotechnology by setting the way for the creation of novel nanoscale devices with specialized optical characteristics.