Journal
OPTICS EXPRESS
Volume 20, Issue 5, Pages 4893-4902Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.004893
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Funding
- UK Engineering and Physical Sciences Research Council
- Leverhulme Trust
- EPSRC [EP/H000917/2, EP/G041768/1, EP/H000917/1, EP/D063329/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G041768/1, EP/D063329/1, EP/H000917/2, EP/H000917/1] Funding Source: researchfish
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Surface Plasmon Polaritons (SPPs) are excited at the interface between a thin gold film and air via the illumination of nanoslits etched into the film. The coupling efficiency to the two propagation directions away from the slits is determined by leakage radiation microscopy, when the angle of incidence of the pump beam is changed from 0 degrees to 20 degrees. We find that preferential coupling of SPPs into one direction can be achieved for non-normal incidence in the case of single slits and slit pairs. The proportion of SPP excited into one direction can be in excess of 90%. We further provide a simple model of the process, and directly compare the performances of the two approaches. (C) 2012 Optical Society of America
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