Blueshift of the surface plasmon resonance in silver nanoparticles studied with EELS

We study the surface plasmon (SP) resonance energy of isolated spherical Ag nanoparticles dispersed on a silicon nitride substrate in the diameter range 3.5-26 nm with monochromated electron energy-loss spectroscopy. A significant blueshift of the SP resonance energy of 0.5 eV is measured when the p...

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Bibliographic Details
Published in:arXiv.org 2013-02
Main Authors: Raza, Søren, Stenger, Nicolas, Shima Kadkhodazadeh, Fischer, Søren V, Kostesha, Natalie, Jauho, Antti-Pekka, Burrows, Andrew, Wubs, Martijn, Mortensen, N Asger
Format: Article
Language:English
Subjects:
Electron density
Electron density profiles
Electron energy
Electron energy loss spectroscopy
Electrons
Nanoparticles
Quantum confinement
Silicon nitride
Silicon substrates
Silver
Surface plasmon resonance
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Summary:We study the surface plasmon (SP) resonance energy of isolated spherical Ag nanoparticles dispersed on a silicon nitride substrate in the diameter range 3.5-26 nm with monochromated electron energy-loss spectroscopy. A significant blueshift of the SP resonance energy of 0.5 eV is measured when the particle size decreases from 26 down to 3.5 nm. We interpret the observed blueshift using three models for a metallic sphere embedded in homogeneous background material: a classical Drude model with a homogeneous electron density profile in the metal, a semiclassical model corrected for an inhomogeneous electron density associated with quantum confinement, and a semiclassical nonlocal hydrodynamic description of the electron density. We find that the latter two models provide a qualitative explanation for the observed blueshift, but the theoretical predictions show smaller blueshifts than observed experimentally.in a homogeneous medium.
ISSN:2331-8422
DOI:10.48550/arxiv.1210.2535