The polarization and distance effect of the double sphere silver nanoparticles to local surface plasmon resonance using boundary element approximation

Abstract

In this work, we have systematically investigated the polarization and distance effect of Ag-NPs double sphere to localized surface plasmon resonance (LSPR) using metallic nanoparticles simulation based on boundary element approximation. Two way polarizations were applied to Ag-NPs double sphere, in parallel and perpendicular polarizations. LSPR profile generally shifted to red-shift as the diameter of Ag-NPs increased both in parallel and perpendicular polarizations. Concerning the polarization direction, we have found that LSPR shifted to blue-shift as the distance of Ag-NPs double sphere increased in parallel polarization, while LSPR shifted to red-shift in perpendicular polarization. The phenomenon can be explained by the dipole-dipole coupling interaction between Ag-NPs double sphere. The results showed that the LPSR profile was not only affected by the diameter size and the distance of Ag-NPs double sphere but also by the polarization direction.