title: Projected Dipole Model for Quantum Plasmonics.
abstract: Quantum effects of plasmonic phenomena have been explored through ab initio studies, but only for exceedingly small metallic nanostructures, leaving most experimentally relevant structures too large to handle. We propose instead an effective description with the computationally appealing features of classical electrodynamics, while quantum properties are described accurately through an infinitely thin layer of dipoles oriented normally to the metal surface. The nonlocal polarizability of the dipole layer-the only introduced parameter-is mapped from the free-electron distribution near the metal surface as obtained with 1D quantum calculations, such as time-dependent density-functional theory (TDDFT), and is determined once and for all. The model can be applied in two and three dimensions to any system size that is tractable within classical electrodynamics, while capturing quantum plasmonic aspects of nonlocal response and a finite work function with TDDFT-level accuracy. Applying the theory to dimers, we find quantum corrections to the hybridization even in mesoscopic dimers, as long as the gap itself is subnanometric.
authors.affiliation: Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.|Center for Nanostructured Graphene, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Wei
authors.initials: W
authors.lastname: Yan
authors.affiliation: Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.|Center for Nanostructured Graphene, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Martijn
authors.initials: M
authors.lastname: Wubs
authors.affiliation: Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.|Center for Nanostructured Graphene, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.|Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Jena 07745, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Asger Mortensen