Journal
OPTICS LETTERS
Volume 32, Issue 17, Pages 2535-2537Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.32.002535
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We show that interfering surface plasmon polaritons can be excited with a focused laser beam at normal incidence to a plane metal film. No protrusions or holes are needed in this excitation scheme. Depending on the axial position of the focus, the intensity distribution on the metal surface is either dominated by interferences between counterpropagating plasmons or by a two-lobe pattern characteristic of localized surface plasmon excitation. Our experiments can be accurately explained by use of the angular spectrum representation and provide a simple means for locally exciting standing surface plasmon polaritons. (c) 2007 Optical Society of America.
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