title: Super-resolution Localization and Defocused Fluorescence Microscopy on Resonantly Coupled Single-Molecule, Single-Nanorod Hybrids.
abstract: Optical antennas made of metallic nanostructures dramatically enhance single-molecule fluorescence to boost the detection sensitivity. Moreover, emission properties detected at the optical far field are dictated by the antenna. Here we study the emission from molecule-antenna hybrids by means of super-resolution localization and defocused imaging. Whereas gold nanorods make single-crystal violet molecules in the tip's vicinity visible in fluorescence, super-resolution localization on the enhanced molecular fluorescence reveals geometrical centers of the nanorod antenna instead. Furthermore, emission angular distributions of dyes linked to the nanorod surface resemble that of nanorods in defocused imaging. The experimental observations are consistent with numerical calculations using the finite-difference time-domain method.
authors.affiliation: Department of Chemistry, KU Leuven , Celestijnenlaan 200F, B-3001 Leuven, Belgium.
authors.forename: Liang
authors.initials: L
authors.lastname: Su
authors.affiliation: Department of Chemistry, KU Leuven , Celestijnenlaan 200F, B-3001 Leuven, Belgium.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Yuan
authors.affiliation: Department of Chemistry, KU Leuven , Celestijnenlaan 200F, B-3001 Leuven, Belgium.
authors.forename: Gang
authors.initials: G
authors.lastname: Lu
authors.affiliation: Department of Chemistry, KU Leuven , Celestijnenlaan 200F, B-3001 Leuven, Belgium.
authors.forename: Susana
authors.initials: S
authors.lastname: Rocha
authors.affiliation: LION, Huygens-Kamerlingh Onnes Laboratory, Leiden University , Niels Bohrweg 2, 2300RA Leiden, The Netherlands.
authors.forename: Michel
authors.initials: M
authors.lastname: Orrit
authors.affiliation: Department of Chemistry, KU Leuven , Celestijnenlaan 200F, B-3001 Leuven, Belgium.|Nano-Science Center, University of Copenhagen , Universitetsparken 5, 2100 Copenhagen, Denmark.
authors.forename: Johan
authors.initials: J
authors.lastname: Hofkens
authors.affiliation: Department of Chemistry, KU Leuven , Celestijnenlaan 200F, B-3001 Leuven, Belgium.|Research Institute for Electronic Science, Hokkaido University , N20W10, Kita-Ward, 001-0020 Sapporo, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Uji-i
keywords: defocused imaging; gold nanorods; optical antennas; plasmon-enhanced fluorescence; single molecules; super-resolution localization
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