DNA-Mediated Self-Assembly of Plasmonic Antennas with a Single Quantum Dot in the Hot Spot.

Nicoli F; Zhang T; Hübner K; Jin B; Selbach F; Acuna G; Argyropoulos C; Liedl T; Pilo-Pais M

doi:10.1002/smll.201804418

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Journal article

DNA-Mediated Self-Assembly of Plasmonic Antennas with a Single Quantum Dot in the Hot Spot.

Nicoli F Faculty of Physics and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität, München (LMU), 80539, Munich, Germany.
Zhang T Faculty of Physics and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität, München (LMU), 80539, Munich, Germany.
Hübner K Department of Chemistry and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität München (LMU), 81377, Munich, Germany.
Jin B Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA.
Selbach F Department of Chemistry and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität München (LMU), 81377, Munich, Germany.
Acuna G Department of Physics, University of Fribourg, 1700, Fribourg, Switzerland.
Argyropoulos C Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA.
Liedl T Faculty of Physics and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität, München (LMU), 80539, Munich, Germany.
Pilo-Pais M Faculty of Physics and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität, München (LMU), 80539, Munich, Germany.

2019-02-09

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Small (Weinheim an der Bergstrasse, Germany). - 2019

English DNA self-assembly is a powerful tool to arrange optically active components with high accuracy in a large parallel manner. A facile approach to assemble plasmonic antennas consisting of two metallic nanoparticles (40 nm) with a single colloidal quantum dot positioned at the hot spot is presented here. The design approach is based on DNA complementarity, stoichiometry, and steric hindrance principles. Since no intermediate molecules other than short DNA strands are required, the structures possess a very small gap (≈ 5 nm) which is desired to achieve high Purcell factors and plasmonic enhancement. As a proof-of-concept, the fluorescence emission from antennas assembled with both conventional and ultrasmooth spherical gold particles is measured. An increase in fluorescence is obtained, up to ≈30-fold, compared to quantum dots without antenna.

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