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Proceedings Paper

Optical manipulation of metal-silica hybrid nanoparticles
Author(s): Rodney R. Agayan; Thomas Horvath; Brandon H. McNaughton; Jeffrey N. Anker; Raoul Kopelman
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Paper Abstract

Metallic nanoparticles are known to experience enhanced optical trap strengths compared to dielectric particles due to the increased optical volume, or polarizability. In our experience, larger metallic particles (~micron) are not easily trapped because momentum effects due to reflection become significant. Hybrid particles comprised of both metal and dielectric materials can circumvent this limitation while still utilizing a larger polarizability. Heterogeneous nanosystems were fabricated by embedding/coating silica nanoparticles with gold or silver in varying amounts and distributions. These compound particles were manipulated via optical tweezers, and their trapping characteristics quantitatively and qualitatively compared to homogeneous particles of comparable size. The parameters explored include the dependence of the trapping force on the percentage of loading of gold, the size of the embedded colloids, and the distribution of metal within the surrounding matrix or on its surface.

Paper Details

Date Published: 18 October 2004
PDF: 12 pages
Proc. SPIE 5514, Optical Trapping and Optical Micromanipulation, (18 October 2004); doi: 10.1117/12.559757
Show Author Affiliations
Rodney R. Agayan, Univ. of Michigan (United States)
Thomas Horvath, Univ. of Michigan (United States)
Brandon H. McNaughton, Univ. of Michigan (United States)
Jeffrey N. Anker, Univ. of Michigan (United States)
Raoul Kopelman, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 5514:
Optical Trapping and Optical Micromanipulation
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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