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

Francesca Nicoli, Tao Zhang, Kristina Hübner, Boyuan Jin, Florian Selbach, Guillermo Acuna, Christos Argyropoulos, Tim Liedl, Mauricio Pilo-Pais

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number1804418
JournalSmall
Volume15
Issue number26
DOIs
StatePublished - Jun 26 2019

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biomaterials
  • General Chemistry
  • General Materials Science

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