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Proceedings Paper

Layer-by-layer optical assembly of colloidal particles
Author(s): Gang Wang
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Paper Abstract

We report our work of binding microscopic particles into three dimension structures through a novel layer-by-layer approach. Multi-beam interferometry was used to form a two dimensional periodic optical field. Such optical landscape was used to trap colloidal particles into a single layer of 2-d colloidal array. A second optical tweezers setup was combined to offset such single-layer 2-d colloidal arrays in the third dimension. A strong electric field was found at the vicinity of each single layer with carefully calculated experimental parameters. Our numerical results suggest that with practical parameters, the strong electric field resulted from the diffraction of trapped particles should trap colloidal particles into a new layer of identical 2-d arrays, thereby offering an alternative approach to optically bind microscopic particles into three dimension periodic structures. Preliminary experimental results of this method demonstrating trapping with secondary diffracted light are also presented.

Paper Details

Date Published: 5 September 2007
PDF: 8 pages
Proc. SPIE 6644, Optical Trapping and Optical Micromanipulation IV, 664417 (5 September 2007); doi: 10.1117/12.733199
Show Author Affiliations
Gang Wang, Indiana Univ.–Purdue Univ., Fort Wayne (United States)

Published in SPIE Proceedings Vol. 6644:
Optical Trapping and Optical Micromanipulation IV
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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