Efficient unidirectional ridge excitation of surface plasmons

I. P Radko, Sergey I. Bozhevolnyi, G. Brucoli, L. Martin-Moreno, F. J. Garcia-Vidal, Alexandra Boltasseva

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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-mu m-wide) laser beam. We demonstrate that, at the resonant wavelength of 816 nm, the excitation efficiency of > 0.4 can be obtained with >= 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. (C) 2009 Optical Society of America
Original languageEnglish
JournalOptics Express
Volume17
Issue number9
Pages (from-to)7228-7232
ISSN1094-4087
DOIs
Publication statusPublished - 2009
Externally publishedYes

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