Simulation of Surface Plasmon Resonance on Different Size of a Single Gold Nanoparticle

Abstract

In this work, the surface plasmon resonance wavelength position is calculated using metal nanoparticle boundary element method (MNPBEM) toolbox from Matlab classes. The surface plasmon resonance wavelength position is determined by full Maxwell's equations. We present a simulation optical properties study of the dependence of the plasmon resonance spectrum of individual gold nanoparticles on the dielectric function and size change in the extinction efficiency spectrum. Previous studies have shown that the shift of the gold nanoparticle plasmon resonance wavelength increased when the size of gold nanoparticles was increased. However, the dielectric function of gold nanoparticle showed a different shifting when using a higher spectral range. In this work, the attention is focused on the size effects of gold nanoparticle on the position of the plasmon resonance wavelength. The aim of this work is to study the behaviour of the resonance position for different diameter size of gold nanoparticle by using boundary element method simulations. The gold nanoparticle diameter between 10 nm to 100 nm is used in determine the shifting of the surface plasmon resonance. The results in this work indicated that the position of the plasmon resonance wavelength for gold nanoparticle was redshift when the size of gold nanoparticle was increased. However, dielectric function measured by previous experiments show that the high spectral resolution gives the significant redshift to the extinction efficiency spectrum.