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Proceedings Paper

Optical forces arising from phase gradients
Author(s): David G. Grier; B. Sun; F. C. Cheong; Y. Roichman; S. H. Lee; Y. Roichman; J. Amato-Grill
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Paper Abstract

Optical traps use forces exerted by specially structured beams of light to localize microscopic objects in three dimensions. In the case of single-beam optical traps, such as optical tweezers, trapping is due entirely to gradients in the light's intensity. Gradients in the light field's phase also control optical forces, however, and their quite general influence on trapped particles' dynamics has only recently been explored in detail. We demonstrate both theoretically and experimentally how phase gradients give rise to forces in optical traps and explore the sometimes surprising influence of phase-gradient forces on trapped objects' motions.

Paper Details

Date Published: 6 February 2009
PDF: 11 pages
Proc. SPIE 7227, Complex Light and Optical Forces III, 72270E (6 February 2009); doi: 10.1117/12.814725
Show Author Affiliations
David G. Grier, New York Univ. (United States)
B. Sun, New York Univ. (United States)
F. C. Cheong, New York Univ. (United States)
Y. Roichman, New York Univ. (United States)
S. H. Lee, Univ. of California, Berkeley (United States)
Y. Roichman, Tel Aviv Univ. (Israel)
J. Amato-Grill, New York Univ. (United States)


Published in SPIE Proceedings Vol. 7227:
Complex Light and Optical Forces III
Enrique J. Galvez; David L. Andrews; Jesper Glückstad, Editor(s)

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