Non-fluorescent nanoscopic monitoring of a single trapped nanoparticle via nonlinear point sources

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Detection of single nanoparticles or molecules has often relied on fluorescent schemes. However, fluorescence detection approaches limit the range of investigable nanoparticles or molecules. Here, we propose and demonstrate a non-fluorescent nanoscopic trapping and monitoring platform that can trap a single sub-5-nm particle and monitor it with a pair of floating nonlinear point sources. The resonant photon funnelling into an extremely small volume of similar to 5 x 5 x 7 nm(3) through the three-dimensionally tapered 5-nm-gap plasmonic nanoantenna enables the trapping of a 4-nm CdSe/ZnS quantum dot with low intensity of a 1560-nm continuous-wave laser, and the pumping of 1560-nm femtosecond laser pulses creates strong background-free second-harmonic point illumination sources at the two vertices of the nanoantenna. Under the stable trapping conditions, intermittent but intense nonlinear optical spikes are observed on top of the second-harmonic signal plateau, which is identified as the 3.0-Hz Kramers hopping of the quantum dot trapped in the 5-nm gap.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2018-06
Language
English
Article Type
Article
Citation

NATURE COMMUNICATIONS, v.9, pp.2218

ISSN
2041-1723
DOI
10.1038/s41467-018-04689-5
URI
http://hdl.handle.net/10203/243694
Appears in Collection
PH-Journal Papers(저널논문)
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