Hybrid quadrupolar resonances stimulated at short wavelengths using coupled plasmonic silver nanoparticle aggregation

Abstract

The coupling interaction among metal nanoparticles can cause asymmetric distribution of the surface charges, which can lead to the cleavage of surface plasmon resonance. Higher order resonance modes in plasmonic nanostructures exhibit sharp resonance and dramatic line shape shifts. These unique resonant behaviours existing in nanostructures can be used to improve the performance of wide band gap semiconductor devices, such as increasing the output power of lasers. According to the theoretical calculation and simulation, silver nanoparticles have been prepared experimentally, and the corresponding extinction spectra were also tested to verify the simulation results. It is found that the hybrid quadrupolar resonance can indeed occur in the short wavelength region.