Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-04689-5
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Funding
- National Research Foundation of Korea (NRF) [NRF-2017M3C1A3013923, NRF-2015K1A4A3047100]
- NRF grant [NRF-2017R1D1A1B03036010]
- KIST Institutional Program [2E26680-16-P024]
- KU-KIST School Project
- NRF [NRF-2017R1D1A1B03036289]
- Ministry of Science and ICT of Korea grant (Global Center for Open Research with Enterprise)
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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.
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