Resonant tunneling of surface plasmon-polaritons

The tunneling of surface plasmon-polaritons (SPPs) across an interruption in the metallic film supporting them is numerically investigated in details. Both non-symmetrical and symmetrical geometries are considered. A very high tunneling efficiency is calculated for the long-range surface plasmon in the symmetrical geometry, with an amplitude transmission as high as 80% over a 5 mu m gap for a 40 nm thick gold film illuminated at lambda= 785nm. The transmission is somewhat lower in the nonsymmetrical geometry. The coupling between the different SPP modes (radiative and non-radiative) in that geometry is also investigated in detail. This coupling depends periodically upon the length of the gap. Overall, the results indicate that SPPs are not very sensitive to technological imperfections and can survive large waveguide interruptions. (C) 2007 Optical Society of America


Published in:
Optics Express, 15, 6380-6388
Year:
2007
Publisher:
Optical Society of America
ISSN:
1094-4087
Keywords:
Laboratories:




 Record created 2011-04-11, last modified 2018-03-17

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