Journal
OPTICS EXPRESS
Volume 17, Issue 9, Pages 7228-7232Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.007228
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Funding
- Danish Technical Research Council [26-04-0158]
- European Network of Excellence, Plasmo-Nano-Devices [FP6-2002-IST-1-507879]
- Spanish MCyT [MAT2005-06608-C02, AP2005-55-185]
- NABIIT [2106-05-033]
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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-mu m-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. (C) 2009 Optical Society of America
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