Journal
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Volume 249, Issue 6, Pages 1178-1187Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201100757
Keywords
coupling efficiency; diffraction gratings; excitation; surface plasmon-polaritons
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Funding
- Consejo Nacional de Ciencia y Tecnologia [150466]
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We present calculations of the efficiency of excitation of surface plasmon-polaritons (SPPs) with surface structures illuminated by focussed beams. First, it is shown that the low reflectivity observed with broad highly directional beams and periodic gratings does not necessarily imply an efficient coupling to SPPs. We then consider the coupling through surface features like steps, grooves and angled steps, and calculate efficiency maps for these structures as functions of the parameters that define them. Finally, we explore the possibilities of improving the coupling efficiency using periodic structures consisting of a small number of rectangular grooves. We find that a surface section with a length of about four wavelengths can couple as much as 45% of the incident light into a directional SPP.
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