Electromagnetic interaction of fluorophores with designed two-dimensional silver nanoparticle arrays |
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Authors: | H Ditlbacher N Felidj JR Krenn B Lamprecht A Leitner FR Aussenegg |
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Institution: | Institute for Experimental Physics, Karl-Franzens-University Graz, and Erwin-Schr?dinger Institute for Nanoscale Research, Graz, Austria, AT Interfaces, Traitements, Organisation et Dynamique des Systemes, Université Paris 7, CNRS UPRES.A, Paris, France, FR
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Abstract: | We study the fluorescence enhancement of dye molecules adsorbed on regular two-dimensional arrays of designed silver nanoparticles.
The silver particles show two orthogonal optical resonances at different wavelengths because of their elongated shape. The
short-wavelength resonance was designed to fit to the absorption maximum of the fluorophore. When the excitation light drives
the short-wavelength resonance, the measured fluorescence intensity is strongly enhanced compared to that for the orthogonal
particle orientation. This shows directly a strong electromagnetic coupling between the nanoparticles and the fluorophore.
Additionally enhanced photochemical bleaching is observed due to the interaction of fluorophores with the particles. Using
a rate model describing the fluorescence enhancement and the bleaching enhancement, an average value for the particle-induced
increase in the radiative fluorescence rate is obtained, together with a lower limit for the averaged particle-induced field
intensity enhancement factor.
Received: 3 July 2001 / Revised version: 3 September 2001 / Published online: 15 October 2001 |
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Keywords: | PACS: 78 67 B 33 50 D |
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