Mapping Nanoscale Hotspots with Single-Molecule Emitters Assembled into Plasmonic Nanocavities Using DNA Origami.
Van De Goor, Tim
de Nijs, Bart
MetadataShow full item record
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 letters, 18 (1), 405-411. https://doi.org/10.1021/acs.nanolett.7b04283
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.
Gold, Carbocyanines, DNA, Fluorescent Dyes, Surface Plasmon Resonance, Nanotechnology, Nanostructures, Metal Nanoparticles, Optics and Photonics
European Research Council (320503)
External DOI: https://doi.org/10.1021/acs.nanolett.7b04283
This record's URL: https://www.repository.cam.ac.uk/handle/1810/277249
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/
Recommended or similar items
The following licence files are associated with this item: