Core–Shell Nanostructures Under Localized Plasmon Resonance Conditions

Abstract

The spectral characteristics of the core–shell-type nanostructures, namely bimetallic nanoshells, metallic nanoparticles with oxide shell, and metal/semiconductor nanoshells in the conditions of localized plasmon resonance have been theoretically studied for the purpose of their further photonics and plasmonics applications. It is shown that by shell or core thickness changing one can shift the spectral position of the surface plasmon absorption peak in the visible spectral region. In the case of metal/semiconductor nanoshells, there is a clearly pronounced additional peak in the absorption and scattering cross-sectional spectra. Such a two-band nature can be explained by the excitation of localized plasmons on two interfaces metal/semiconductor and metal/surrounding medium.