Plasmonics of regular shape particles, a simple group theory approach

Sarra Mitiche (1) , Sylvie Marguet (2) , Fabrice Charra (1) , Ludovic Douillard (1)

1 LEPO - Laboratoire d'Electronique et nanoPhotonique Organique
2 LEDNA - Laboratoire Edifices Nanométriques

A simple hand calculation method based on group theory is proposed to predict the near field maps of finite metallic nanoparticles (MNP) of canonical geometries: prism, cube, hexagon, disk, sphere, etc. corresponding to low order localized surface plasmon resonance excitations. In this article, we report the principles of the group theory approach and demonstrate, through several examples, the general character of the group theory method which can be applied to describe the plasmonic response of particles of finite or infinite symmetry point groups. Experimental validation is achieved by collection of high-resolution subwavelength near-field maps by photoemission electron microscopy (PEEM) on a representative set of Au colloidal particles exhibiting either finite (hexagon) or infinite (disk, sphere) symmetry point groups.

Mots clés: Surface plasmon resonance; group theory; hexagon; disk; sphere; photoemission electron microscopy (PEEM).

Domaines: Matériaux

Sarra Mitiche, Sylvie Marguet, Fabrice Charra, Ludovic Douillard. Plasmonics of regular shape particles, a simple group theory approach. Nano Research, 2020, 13, pp.1597-1603. ⟨10.1007/s12274-020-2776-y⟩. ⟨cea-02557861⟩