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Título : Nonlocal effects in the plasmons of nanowires and nanocavities excited by fast electron beams
Autor : Aizpurua, Javier ; Rivacoba, Alberto
Palabras clave : Electron energy loss spectra
Metals
Nanowires
Spectral line shift
Surface plasmons
Fecha de publicación : 2-jul-2008
Editor: American Physical Society
Citación : Physical Review B 78, 035404 (2008).
Resumen: The solutions of surface modes in cylindrical metallic wires and cavities are obtained within a nonlocal dielectric formalism. We compare the results with those obtained from standard local approaches. The specular reflection model is applied to describe the nonlocal potentials in the vicinity of the wires and cavities. The external probe exciting the surface plasmons are fast electron beams traveling parallel to the wires and cavities, as those commonly used in electron microscopy and cathodoluminescence. Energy-loss spectra due to surface-plasmon excitation are calculated with use of the nonlocal formalism both for electron trajectories near a metallic nanowire and a metallic nanocavity. When nonlocal effects are considered, the intensity of the plasmon excitation is reduced, and a blueshift of the energy is observed. This effect is more pronounced for very thin wires and cavities where the cylindrical interfaces are strongly interacting. The blueshifts reported here are important for the accurate design of the plasmon response in one-dimensional metallic nanostructures.
Descripción : 14 pp.-- PACS: 73.20.Mf, 79.20.Uv, 68.37.Lp, 78.70.-g.
Versión del editor: http://dx.doi.org/10.1103/PhysRevB.78.035404
URI : http://hdl.handle.net/10261/7313
DOI: 10.1103/PhysRevB.78.035404
ISSN: 1098-0121
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