Electromagnetic interaction of fluorophores with designed two-dimensional silver nanoparticle arrays |
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Authors: | H. Ditlbacher N. Felidj J.R. Krenn B. Lamprecht A. Leitner F.R. Aussenegg |
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Affiliation: | 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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