Generation of Traveling Surface Plasmon Waves by Free-Electron Impact

The injection of a beam of free 50 keV electrons into an unstructured gold surface creates a highly localized source of traveling surface plasmons with spectra centered below the surface plasmon resonance frequency. The plasmons were detected by a controlled decoupling into light with a grating at a...

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Bibliographic Details
Published in:Nano letters 2006-06, Vol.6 (6), p.1113-1115
Main Authors: Bashevoy, M. V, Jonsson, F, Krasavin, A. V, Zheludev, N. I, Chen, Y, Stockman, M. I
Format: Article
Language:English
Subjects:
Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
Computer Simulation
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electrons
Exact sciences and technology
Gold - chemistry
Gold - radiation effects
Models, Chemical
Nanostructures - chemistry
Nanostructures - radiation effects
Photons
Physics
Radiation Dosage
Radiometry - methods
Scattering, Radiation
Surface and interface electron states
Surface Plasmon Resonance - methods
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Summary:The injection of a beam of free 50 keV electrons into an unstructured gold surface creates a highly localized source of traveling surface plasmons with spectra centered below the surface plasmon resonance frequency. The plasmons were detected by a controlled decoupling into light with a grating at a distance from the excitation point. The dominant contribution to the plasmon generation appears to come from the recombination of d-band holes created by the electron beam excitation.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl060941v