Non-fluorescent nanoscopic monitoring of a single trapped nanoparticle via nonlinear point sources
| Autor: | Jungmin Lee, Myung Ki Kim, Chang Kyu Kim, Yong-Hee Lee, Sangyoon Han, Seung Ju Yoon, Chi Won Ahn |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Photon
Materials science Science General Physics and Astronomy Physics::Optics 02 engineering and technology Trapping 01 natural sciences General Biochemistry Genetics and Molecular Biology Article law.invention law 0103 physical sciences lcsh:Science 010306 general physics Nanoscopic scale Plasmon Multidisciplinary business.industry General Chemistry 021001 nanoscience & nanotechnology Laser Quantum dot Femtosecond Particle Optoelectronics lcsh:Q 0210 nano-technology business |
| Zdroj: | Nature Communications, Vol 9, Iss 1, Pp 1-8 (2018) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | 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. Detection of single nanoparticles or molecules often relies on the attachment of fluorescent labels. Here, the authors demonstrate trapping a single nanoparticle on a bowtie nanoantenna and monitoring via second harmonic generation from the particle. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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