Efficient unidirectional ridge excitation of surface plasmons.

نویسندگان

  • I P Radko
  • S I Bozhevolnyi
  • G Brucoli
  • L Martín-Moreno
  • F J García-Vidal
  • A Boltasseva
چکیده

Using leakage-radiation microscopy, we characterize the efficiency of unidirectional surface-plasmon excitation with periodic (800 nm) arrays of 130-nm-high and 330-nm-wide gold ridges on a thin gold film illuminated with a focused (5-microm-wide) laser beam. We demonstrate that, at the resonant wavelength of 816 nm, the excitation efficiency of > 0.4 can be obtained with >or= 5 ridges by adjusting the beam position. Conducting numerical simulations, we account for the experimental results and calculate the electric-field enhancement achieved near the gold surface.

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عنوان ژورنال:
  • Optics express

دوره 17 9  شماره 

صفحات  -

تاریخ انتشار 2009