Multipolar Plasmon Resonances in Individual

ow-dimensional metallic nanostruc-tures have been the objects of con-siderable interest during the past de-cade owing to their support of propagating and localized surface plasmon polaritons (SPPs) and collective oscillations of electron gas at the metaldielectric interfaces.1 The localized surface plasmon resonances (LSPRs) in metal nanoparticles (NPs) can re-sult in a drastically enhanced electromag-netic field, which is the physical basis for surface-enhanced Raman scattering (SERS)24 and fluorescence.5,6 The LSPRs of single NPs depend strongly on their size, shape, material, incident excitation, an