Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 50: Coupled Nanostructures and Light Localization

O 50.3: Vortrag

Mittwoch, 18. März 2015, 11:00–11:15, MA 043

Dirac-like plasmons in honeycomb lattices of metallic nanoparticles — •Guillaume Weick¹, Claire Woollacott², William L. Barnes², Ortwin Hess³, and Eros Mariani¹ — ¹Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504, F-67034 Strasbourg, France — ²Centre for Graphene Science, Department of Physics and Astronomy, University of Exeter, EX4 4QL Exeter, UK — ³The Blackett Laboratory, Department of Physics, Imperial College London, South Kensington Campus, London SW7 2AZ, UK

We consider a two-dimensional honeycomb lattice of metallic nanoparticles, each supporting a localized surface plasmon, and study the quantum properties of the collective plasmons resulting from the near field dipolar interaction between the nanoparticles. We analytically investigate the dispersion, the effective Hamiltonian and the eigenstates of the collective plasmons for an arbitrary orientation of the individual dipole moments. When the polarization points close to the normal to the plane the spectrum presents Dirac cones, similar to those present in the electronic band structure of graphene. We derive the effective Dirac Hamiltonian for the collective plasmons and show that the corresponding spinor eigenstates represent Dirac-like massless bosonic excitations that present similar effects to electrons in graphene. We further discuss how one can manipulate the Dirac points in the Brillouin zone and open a gap in the collective plasmon dispersion by modifying the polarization of the localized surface plasmons. Ref: G. Weick et al., PRL 110, 106801 (2013)