Optical absorption of torus-shaped metal nanoparticles in the visible range

Alexandre Mary (1) , D. M. Koller (2) , A. Hohenau (2) , J. R. Krenn (2) , Alexandre Bouhelier (3) , Alain Dereux (3)

1 DFTMC - Departamento de Física Teórica de la Materia Condensada [Madrid]
2 Institute for Experimental Physics [Graz]
3 ICB - Laboratoire Interdisciplinaire Carnot de Bourgogne

We theoretically and experimentally investigated the optical response of a thin metal nanotorus in the visible range. The close formulas describing the extinction cross sections of a torus are obtained in the nonretarded approximation. We demonstrate a good agreement between numerical simulations and experimental data. Our findings show that the main resonance is highly sensitive to the external medium and the geometrical parameters of the particle.

Mots clés: SURFACE PLASMON; TORUS; SPECTROSCOPY

Domaines: Micro et nanotechnologies/Microélectronique; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]; Optique [physics.optics]

Alexandre Mary, D. M. Koller, A. Hohenau, J. R. Krenn, Alexandre Bouhelier, et al.. Optical absorption of torus-shaped metal nanoparticles in the visible range. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2007, 76, pp.245422. ⟨10.1103/PhysRevB.76.245422⟩. ⟨hal-00472399⟩