Nanoshells are designed to have a core-shell structure, where the core is typically made of a dielectric material like silica and the shell is composed of a thin metal layer, often gold. By adjusting the relative sizes of the core and shell, the optical properties of these nanoparticles can be finely tuned. This property is harnessed in medical imaging and therapies, where nanoshells can be used to target specific cells and tissues.
