Mapping Nanoscale Hotspots with Single-Molecule Emitters Assembled into Plasmonic Nanocavities Using DNA Origami.
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Authors
Turek, Vladimir
Kongsuwan, Nuttawut
Benz, Felix
Carnegie, Cloudy
de Nijs, Bart
Demetriadou, Angela
Publication Date
2018-01-10Journal Title
Nano Lett
ISSN
1530-6984
Publisher
American Chemical Society (ACS)
Volume
18
Issue
1
Pages
405-411
Language
eng
Type
Article
This Version
VoR
Physical Medium
Print-Electronic
Metadata
Show full item recordCitation
Chikkaraddy, R., Turek, V., Kongsuwan, N., Benz, F., Carnegie, C., Van De Goor, T., de Nijs, B., et al. (2018). Mapping Nanoscale Hotspots with Single-Molecule Emitters Assembled into Plasmonic Nanocavities Using DNA Origami.. Nano Lett, 18 (1), 405-411. https://doi.org/10.1021/acs.nanolett.7b04283
Abstract
Fabricating nanocavities in which optically active single quantum emitters are precisely positioned is crucial for building nanophotonic devices. Here we show that self-assembly based on robust DNA-origami constructs can precisely position single molecules laterally within sub-5 nm gaps between plasmonic substrates that support intense optical confinement. By placing single-molecules at the center of a nanocavity, we show modification of the plasmon cavity resonance before and after bleaching the chromophore and obtain enhancements of ≥4 × 103 with high quantum yield (≥50%). By varying the lateral position of the molecule in the gap, we directly map the spatial profile of the local density of optical states with a resolution of ±1.5 nm. Our approach introduces a straightforward noninvasive way to measure and quantify confined optical modes on the nanoscale.
Keywords
Gold, Carbocyanines, DNA, Fluorescent Dyes, Surface Plasmon Resonance, Nanotechnology, Nanostructures, Metal Nanoparticles, Optics and Photonics
Sponsorship
Biotechnology and Biological Sciences Research Council (BB/I022686/1)
European Research Council (320503)
Engineering and Physical Sciences Research Council (EP/L027151/1)
Engineering and Physical Sciences Research Council (EP/L015978/1)
Engineering and Physical Sciences Research Council (EP/G060649/1)
Engineering and Physical Sciences Research Council (EP/K028510/1)
Identifiers
External DOI: https://doi.org/10.1021/acs.nanolett.7b04283
This record's URL: https://www.repository.cam.ac.uk/handle/1810/277249
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