Journal
OPTICS LETTERS
Volume 28, Issue 20, Pages 1870-1872Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.28.001870
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Efficient outcoupling of surface-plasma waves to radiation modes by use of dielectric diffraction gratings on a flat metallic surface is discussed. The dielectric gratings, which have a surface-relief structure with only several tens of nanometers in peak-to-trough height on a flat metal surface, can efficiently extract radiation modes propagating in free space from the surface-plasmon modes. An outcoupling efficiency of 50% is estimated with the rigorous coupled-wave diffraction theory, and it is confirmed by the experiment. (C) 2003 Optical Society of America.
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