Resonance shifts and spill-out effects in self-consistent hydrodynamic nanoplasmonics

Giuseppe Toscano, Jakob Straubel, Alexander Kwiatkowski, Carsten Rockstuhl, Ferdinand Evers, Hongxing Xu, N. Asger Mortensen, Martijn Wubs

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Abstract

The standard hydrodynamic Drude model with hard-wall boundary conditions can give accurate quantitative predictions for the optical response of noble-metal nanoparticles. However, it is less accurate for other metallic nanosystems, where surface effects due to electron density spill-out in free space cannot be neglected. Here we address the fundamental question whether the description of surface effects in plasmonics necessarily requires a fully quantum-mechanical ab initio approach. We present a self-consistent hydrodynamic model (SC-HDM), where both the ground state and the excited state properties of an inhomogeneous electron gas can be determined. With this method we are able to explain the size-dependent surface resonance shifts of Na and Ag nanowires and nanospheres. The results we obtain are in good agreement with experiments and more advanced quantum methods. The SC-HDM gives accurate results with modest computational effort, and can be applied to arbitrary nanoplasmonic systems of much larger sizes than accessible with ab initio methods.
Original languageEnglish
Article number7132
JournalNature Communications
Volume6
Issue number7132
Number of pages11
ISSN2041-1723
DOIs
Publication statusPublished - 2015

Bibliographical note

This work is licensed under a Creative Commons Attribution 4.0 International license. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Keywords

  • hydrodynamic nanoplasmonics
  • resonance shifts
  • silver nanowires
  • sodium nanowires
  • surface resonance shifts
  • 04500, Mathematical biology and statistical methods
  • 10502, Biophysics - General
  • 10515, Biophysics - Biocybernetics
  • Computational Biology
  • quantum-mechanical ab initio approach mathematical and computer techniques
  • self consistent hydrodynamic model mathematical and computer techniques
  • Models and Simulations
  • Physics
  • MULTIDISCIPLINARY
  • SURFACE-PLASMON DISPERSION
  • DENSITY-FUNCTIONAL THEORY
  • METAL-SURFACES
  • KINETIC-ENERGY
  • OPTICAL-RESPONSE
  • WORK FUNCTION
  • NONLOCAL RESPONSE
  • NANOWIRE DIMERS
  • ELECTRON-GAS
  • MODEL
  • physics.optics cond-mat.mes-hall

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