Efficient unidirectional ridge excitation of surface plasmons

Ilya Radko, Sergey I. Bozhevolnyi, G. Brucoli, L. Martin-Moreno, F. J. Garcia-Vidal, Alexandra Boltasseva

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Abstrakt

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-μm-wide) laser beam. We demonstrate that, at the resonant wavelength of 816 nm, the excitation efficiency of > 0.4 can be obtained with ≥ 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.
OriginalsprogEngelsk
TidsskriftOptics Express
Vol/bind17
Udgave nummer9
Sider (fra-til)7228-7232
ISSN1094-4087
DOI
StatusUdgivet - 2009

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