Near-field optical properties of localized plasmons around lithographically designed nanostructures

This article presents a theoretical study of the near-field optical properties of subwavelength resonant metallic particles deposited on a surface. Using the Green’s dyadic method, we derive stable solutions for both electric and magnetic fields inside and outside metallic particles of arbitrary shape. To assess the reliability of the computational scheme applied to resonant particles, we compare our data with those produced by other models. Since the Green’s dyadic method allows us to cope with particles exhibiting sharp edges such as lithographically designed nanostructures, we explore mesoscopic optical effects which are out of reach of standard computational methods.