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Proceedings Paper

Force measurement and optical assisted particle separation in an optical standing wave
Author(s): W. Mu; Z. Li; L. Luan; P. West; H. Kyriazes; G. C. Spalding; G. Wang; A. Feinerman; J. B. Ketterson
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Paper Abstract

We have measured the optical force on isolated particles trapped in an optical lattice generated by the interference of two coherent laser beams by a method based on the equipartition theorem and by an independent method based on hydrodynamic-drag. The experimental results show that the optical force on a particle in this type of optical lattice depends strongly on the ratio of the particle diameter to the period of the lattice. By tuning this ratio, the force due to the optical lattice can be made to vanish. We also formed optical lattices involving two independent standing waves with different spatial periods formed by tightly focusing four laser beams which are pair wise coherent. By shifting the relative phases of the interfering beams we can advance the two waves in opposite directions. Depending on the spacing and the translation speed of the two interference patterns, appropriately sized particles can be translated in opposite directions; using this approach we succeeded in separating two different sizes of particles in the presence of a simulated fluid flow.

Paper Details

Date Published: 5 September 2007
PDF: 8 pages
Proc. SPIE 6644, Optical Trapping and Optical Micromanipulation IV, 66440R (5 September 2007); doi: 10.1117/12.740850
Show Author Affiliations
W. Mu, Northwestern Univ. (United States)
Z. Li, Northwestern Univ. (United States)
L. Luan, Northwestern Univ. (United States)
P. West, Michigan Technological Univ. (United States)
H. Kyriazes, Niles North High School (United States)
G. C. Spalding, Illinois Wesleyan Univ. (United States)
G. Wang, Indiana Univ.–Purdue Univ., Fort Wayne (United States)
A. Feinerman, Univ. of Illinois at Chicago (United States)
J. B. Ketterson, Northwestern Univ. (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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