Plasmonic nanoshells show great promise in a wide range of quantum applications due to the tunability of the plasmon frequency across a broad spectral range. We aim of giving a clear detailed analysis of the onset of plasmon generation and subsequent sustenance of plasmons on nanoshells in the quantum limit, and provide a fully quantum mechanical description of nanoshells using real-time and real-space time-dependent density functional theory. In nanoshells with medium and thick metallic layers, we identify two types of quantum core plasmons modes, each mixing with symmetrically or antisymmetrically coupled plasmons. We study the dependency of optical properties on aspect ratio, overall size, ground-state electron density profile, spillout, material, and symmetry of nanoshells.
This project is supported by Monash University through the NCI LIEF Strategic Partner Allocation and MASSIVE HPC facility (www.massive. org.au).