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

Toscano, Giuseppe and Straubel, Jakob and Kwiatkowski, Alexander and Rockstuhl, Carsten and Evers, Ferdinand and Xu, Hongxing and Mortensen, N. Asger and Wubs, Martijn (2015) Resonance shifts and spill-out effects in self-consistent hydrodynamic nanoplasmonics. NATURE COMMUNICATIONS, 6: 7132. ISSN 2041-1723,

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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.

Item Type: Article
Uncontrolled Keywords: SURFACE-PLASMON DISPERSION; DENSITY-FUNCTIONAL THEORY; METAL-SURFACES; KINETIC-ENERGY; OPTICAL-RESPONSE; WORK FUNCTION; NONLOCAL RESPONSE; NANOWIRE DIMERS; ELECTRON-GAS; MODEL;
Subjects: 500 Science > 530 Physics
Divisions: Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Ferdinand Evers
Depositing User: Dr. Gernot Deinzer
Date Deposited: 18 Jul 2019 10:49
Last Modified: 18 Jul 2019 10:49
URI: https://pred.uni-regensburg.de/id/eprint/5543

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