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Opt Lett. 2003 Oct 15;28(20):1870-2.

Resonant coupling of surface plasmons to radiation modes by use of dielectric gratings.

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Deportment of Physics, Hanyang University, 17 Hengdang, Sungdong, Seoul 133-791, Korea.


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.


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