Resonant coupling of surface plasmons to radiation modes by use of dielectric gratings.
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.
Deportment of Physics, Hanyang University, 17 Hengdang, Sungdong, Seoul 133-791, Korea. spark@etri.re.kr
Suntak
S
Park
Gwansu
G
Lee
Seok Ho
SH
Song
Cha Hwan
CH
Oh
Pill Soo
PS
Kim