title: Gold nanoparticles quench fluorescence by phase induced radiative rate suppression.
abstract: The fluorescence quantum yield of Cy5 molecules attached to gold nanoparticles via ssDNA spacers is measured for Cy5-nanoparticle distances between 2 and 16 nm. Different numbers of ssDNA per nanoparticle allow to fine-tune the distance. The change of the radiative and nonradiative molecular decay rates with distance is determined using time-resolved photoluminescence spectroscopy. Remarkably, the distance dependent quantum efficiency is almost exclusively governed by the radiative rate.
authors.affiliation: Photonics and Optoelectronics Group, Physics Department and CeNS, Ludwig-Maximilians-Universität München, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Dulkeith
authors.forename: M
authors.initials: M
authors.lastname: Ringler
authors.forename: T A
authors.initials: TA
authors.lastname: Klar
authors.forename: J
authors.initials: J
authors.lastname: Feldmann
authors.forename: A
authors.initials: A
authors.lastname: Muñoz Javier
authors.forename: W J
authors.initials: WJ
authors.lastname: Parak
mesh_terms: D002232:Carbocyanines / Q000737:chemistry*; D004277:DNA, Single-Stranded / Q000737:chemistry*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*
chemical_list: D002232:Carbocyanines; D004277:DNA, Single-Stranded; D005456:Fluorescent Dyes; C085321:cyanine dye 5; D006046:Gold