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 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.
Bashevoy
M V
MV
EPSRC Nanophotonics Portfolio Centre, School of Physics and Astronomy, University of Southampton, SO17 1BJ, United Kingdom.
Jonsson
F
F
Krasavin
A V
AV
Zheludev
N I
NI
Chen
Y
Y
Stockman
M I
MI
D003198:Computer Simulation; D004583:Electrons; D006046:Gold / Q000737:chemistry* / Q000528:radiation effects; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects; D017785:Photons; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*
D006046:Gold