Levitated Plasmonic Nanoantennas in an Aqueous Environment

We report on the manipulation of a plasmonic nanoantenna in an aqueous solution using an electrostatic trap created between a glass nanopipette and a substrate. By scanning a trapped gold nanosphere in the near field of a single colloidal quantum dot embedded under the substrate surface, we demonstr...

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Published in:ACS nano 2017-08, Vol.11 (8), p.7674-7678
Main Authors: Tuna, Yazgan, Kim, Ji Tae, Liu, Hsuan-Wei, Sandoghdar, Vahid
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Language:English
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description We report on the manipulation of a plasmonic nanoantenna in an aqueous solution using an electrostatic trap created between a glass nanopipette and a substrate. By scanning a trapped gold nanosphere in the near field of a single colloidal quantum dot embedded under the substrate surface, we demonstrate about 8-fold fluorescence enhancement over a lateral full width at half-maximum of about 45 nm. We analyze our results with the predictions of numerical electromagnetic simulations under consideration of the electrostatic free energy in the trap. Our approach could find applications in a number of experiments, where plasmonic effects are employed at liquid–solid interfaces.
doi_str_mv 10.1021/acsnano.7b03310
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title Levitated Plasmonic Nanoantennas in an Aqueous Environment
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