Optical Properties of Nanospheres

Optical properties of core/shell silver/silica nanoparticles such as extinction, absorption and scattering cross section are studied based on Mie theory. The numerical simulation results show that optical properties of silver and silica/silver core/shell nanospheres are mainly dependent on their sizes and geometries. The wavelength corresponding to maximum extinction shifts to longer wavelengths as the size of the nanoparticle is increased. The influence of higher-order multipoles is evident for large nanoparticles, making the spectra more complex. When the shell thickness of a core/shell particle is decreased, the plasmon resonance shifts to longer wavelengths. This red shift is accompanied by an increase in peak intensity

Keywords:

Mie Theory , Nanospheres , Optical Properties