Plasmon Resonances in Metal Nanoparticles with Sharp Edges and Vertices: A Material Independent Approach

摘要

By examples of nanoparticles with superellipsoidal shapes, we investigate the optical properties of the entire family of metallic nanoparticles of cubic symmetry. In particular, we find drastic changes in the plasmonic spectrum when the nanoparticle varies its form from the spherical to the cubic one. This would allow one to monitor, e.g., the nanoparticle growth in situ by purely spectroscopic methods. We also find that the dipolar "vertex" modes dominate the spectrum of the cubic nanoparticles.