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Proceedings Paper

Wide-field light scattering imaging of laser trapping dynamics of single gold nanoparticles in solution
Author(s): Takayuki Uwada; Teruki Sugiyama; Atsushi Miura; Hiroshi Masuhara
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Paper Abstract

We present direct observation of particle transfer and assembling upon laser irradiation under a microscope. We employed gold nanoparticles (60 nm) dispersed in water as optical markers and studied laser trapping and accompanying phenomenon by wide-field Rayleigh scattering microscopy. At the focal spot of the near IR laser, laser trapping of gold was observed. Simultaneously, we observed that the particle migration toward the focal spot from all the directions within several tens micrometer. We consider that thermocapillary effect due to laser heating can assist the particle migration from far away, resulting in concentration increase not only at the focal point but also near the surrounding area.

Paper Details

Date Published: 28 August 2010
PDF: 8 pages
Proc. SPIE 7762, Optical Trapping and Optical Micromanipulation VII, 77620N (28 August 2010); doi: 10.1117/12.860433
Show Author Affiliations
Takayuki Uwada, National Chiao Tung Univ. (Taiwan)
Nara Institute of Science and Technology (Japan)
Teruki Sugiyama, Nara Institute of Science and Technology (Japan)
Atsushi Miura, National Chiao Tung Univ. (Taiwan)
Hiroshi Masuhara, National Chiao Tung Univ. (Taiwan)
Nara Institute of Science and Technology (Japan)


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

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