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Proceedings Paper

All-optical positioning of single and multiple Au nanoparticles on surfaces using optical trapping
Author(s): Mason J. Guffey; Norbert F. Scherer
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Paper Abstract

Plasmonic metal nanoparticles have recently generated significant interest in both fundamental and applied nanoscience. An emerging area of interest within plasmonics is the study of optical forces on metal nanoparticles. These forces can be used to manipulate and assemble particles into useful geometries. In this work Au nanoparticles are optically trapped and deposited onto surfaces using both focused beam (gradient) as well as total internal reflection (TIR) based optical trapping. In the case of focused beam trapping, single spherical Au nanoparticles can be rapidly deposited to arbitrary locations on a surface with high spatial precision (~100 nm). By controlling both the particle stability and the surface chemistry, large areas (10's of μm2) can be patterned with Au nanoparticles. For TIR-based trapping, dense arrays of high-aspect ratio Au bipyramids with spot sizes ~10 μm2 are deposited on surfaces. Au bipyramids are deposited via a plasmon-selective photothermal heating mechanism. Both of these methods are fast (patterning large areas in minutes) and require no lithography or scanning probes.

Paper Details

Date Published: 27 August 2010
PDF: 15 pages
Proc. SPIE 7762, Optical Trapping and Optical Micromanipulation VII, 77623H (27 August 2010); doi: 10.1117/12.871881
Show Author Affiliations
Mason J. Guffey, The Univ. of Chicago (United States)
James Franck Institute (United States)
Norbert F. Scherer, The Univ. of Chicago (United States)
Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 7762:
Optical Trapping and Optical Micromanipulation VII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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