Journal
APPLIED PHYSICS LETTERS
Volume 88, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2176862
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We study the enhancement of fluorescence by Ag nanopillars on a semiconducting substrate in which the pillar size, shape, and spacing is varied systematically using electron-beam lithography. Local maxima in the enhancement versus lateral size, as large as a factor of similar to 20 are observed, and vary both with the shape of the pillars and the wavelength of the excitation. We find that the size, shape, and spacing dependence is in qualitative agreement with a model based upon resonant coupling with particle plasmon polaritons. We also find increased enhancement for particle shapes producing high local electric fields. (c) 2006 American Institute of Physics.
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