Preparation and Optical Properties of Metallodielectric Core−Shell−Corona Particles

Abstract

The preparation of metallodielectric core−shell−corona particles is described, and their optical properties are analyzed using the discrete dipole approximation. These particles consist of a spherical gold core coated with a thin dielectric layer and an outer gold layer (the corona). We demonstrate that stable dispersions of these particles possess plasmon modes in the near-infrared that can be tuned in a controlled fashion, while particle diameters can be kept below 100 nm.