Abstract

Propagation of surface plasmons on gold in the range 2.8–3.5 eV over 0.1–1.6 μm distances was characterized by cathodoluminescence spectroscopy. Surface plasmons were excited by an electron beam near a grating milled in the gold. The spectra of outcoupled radiation reveal increasingly strong propagation losses as surface plasmon energy increases above 2.8 eV, but little effect in the range 1.6–2.8 eV. These results are in partial agreement with theoretical expectations.

© 2008 Optical Society of America

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