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

Seung Ju Yoon, Jungmin Lee, Sangyoon Han, Chang-Kyu Kim, Chi Won Ahn, Myung-Ki Kim () and Yong-Hee Lee ()
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Seung Ju Yoon: Korea Advanced Institute of Science and Technology (KAIST)
Jungmin Lee: Korea Advanced Institute of Science and Technology (KAIST)
Sangyoon Han: Korea Advanced Institute of Science and Technology (KAIST)
Chang-Kyu Kim: Korea Polytechnic University
Chi Won Ahn: KAIST, National NanoFab Center (NNFC)
Myung-Ki Kim: Korea University
Yong-Hee Lee: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract 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 ~5 × 5 × 7 nm3 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.

Date: 2018
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DOI: 10.1038/s41467-018-04689-5

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