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, Yong Hee Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Article number2218
JournalNature communications
Volume9
Issue number1
DOIs
Publication statusPublished - 2018 Dec 1

Fingerprint

Quantum Dots
Nanoparticles
point sources
Semiconductor quantum dots
Lasers
trapping
Pumping (laser)
nanoparticles
Molecules
Continuous wave lasers
Monitoring
Ultrashort pulses
Lighting
Photons
quantum dots
harmonics
Limit of Detection
Fluorescence
continuous wave lasers
spikes

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Non-fluorescent nanoscopic monitoring of a single trapped nanoparticle via nonlinear point sources. / Yoon, Seung Ju; Lee, Jungmin; Han, Sangyoon; Kim, Chang Kyu; Ahn, Chi Won; Kim, Myung-Ki; Lee, Yong Hee.

In: Nature communications, Vol. 9, No. 1, 2218, 01.12.2018.

Research output: Contribution to journalArticle

Yoon, Seung Ju ; Lee, Jungmin ; Han, Sangyoon ; Kim, Chang Kyu ; Ahn, Chi Won ; Kim, Myung-Ki ; Lee, Yong Hee. / Non-fluorescent nanoscopic monitoring of a single trapped nanoparticle via nonlinear point sources. In: Nature communications. 2018 ; Vol. 9, No. 1.
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