Polarization and incident angle-dependent plasmonic coupling of Au@Ag nanoalloys

Abstract

Localized surface plasmon resonance (LSPR) between noble metal nanoparticles (NPs) have been widely studied due to its efficient plasmonic enhancement. However, researches on plasmonic coupling between nanoalloy heterostructures are lacking. We successfully syntheized Au@Ag core-shell nanorods (NRs) via a facile seed-mediated method, and numerically simulated the polarization and incident angle-dependent plasmonic coupling between Au@Ag NP dimers. With different arrangements, the dimers exhibit various plasmonic coupling modes. Our result provides theoretical guidance for the LSPR effect in single-particle systems.