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Opto-thermophoretic separation and trapping of plasmonic nanoparticles

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Title: Opto-thermophoretic separation and trapping of plasmonic nanoparticles
Authors: Setoura, Kenji Browse this author →KAKEN DB
Tsuji, Tetsuro Browse this author
Ito, Syoji Browse this author
Kawano, Satoyuki Browse this author
Miyasaka, Hiroshi Browse this author
Issue Date: 28-Nov-2019
Publisher: Royal Society of Chemistry
Journal Title: Nanoscale
Volume: 11
Issue: 44
Start Page: 21093
End Page: 21102
Publisher DOI: 10.1039/c9nr05052c
Abstract: Optical tweezers are powerful tools to trap, transport, and analyse individual nano-objects at dilute concentrations. However, it is still challenging to manipulate isolated single nano-objects in dense target environments with various kinds of materials, such as in living cells and mixtures of nanocolloids. In the present work, we have succeeded in the selective trapping of a few gold nanoshells with specific sizes and sweeping others out completely, only by irradiating the dense colloidal suspension of gold nanoshells with a focused near infrared continuous-wave (CW) laser. This was achieved by an interplay between optical gradient- and thermophoretic forces: while the gradient force traps the targets at the focal spot, the thermophoretic force pushes others out from the focal spot. The distance between the trapped targets and the separated others was longer than 20 mu m, allowing us to measure plasmonic scattering spectra of the trapped targets at a single-nanoparticle level. The present method paves a way for manipulating and analysing single nano-objects in dense mixtures of targets and various kinds of materials.
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 瀬戸浦 健仁

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