LAUSR

Abstract A new composite nanostructure, placing two circle Ag nanoparticles (NPs) on the surface of a SiO2 ellipsoid nanoparticle (abbreviated as AgNPs@SE), was established to analyze the extinction spectra using finite-difference time-domain (FDTD) method. We would show that the new constructed AgNPs@SE nanostructure had exhibited better extinction performance as compared to an isolated NP. Furthermore, we would optimize the performance by tuning structural parameters of the constructed AgNPs@SE nanostructure, including the angle of Ag NPs and aspect ratios of SiO2 ellipsoid NP. We could prove that the constructed nanostructure with the end-to-end orientation model of the AgNPs@SE nanostructure had existed exciting hot spot. Moreover, the array of multimer was also constructed for further investigation. This work could helpful for the design of the AgNPs@SE multimer nanostructure, which can be used to assist photo-catalysis and surface-enhanced Raman spectroscopy (SERS).