Journal article
Efficient unidirectional ridge excitation of surface plasmons
Institute of Sensors, Signals and Electrotechnics, University of Southern Denmark, Odense M, Denmark. ilr@sense.sdu.dk1
Using leakage-radiation microscopy, we characterize the efficiency of unidirectional surface-plasmon excitation with periodic (800 nm) arrays of 130-nm-high and 330-nm-wide gold ridges on a thin gold film illuminated with a focused (5-microm-wide) laser beam. We demonstrate that, at the resonant wavelength of 816 nm, the excitation efficiency of > 0.4 can be obtained with >or= 5 ridges by adjusting the beam position.
Conducting numerical simulations, we account for the experimental results and calculate the electric-field enhancement achieved near the gold surface.
Language: | English |
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Publisher: | The Optical Society |
Year: | 2009 |
Pages: | 7228-32 |
ISSN: | 10944087 |
Types: | Journal article |
DOI: | 10.1364/oe.17.007228 |