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Optical Engineering

Gradient force pattern of truncated hyperbolic-cosine-Gaussian beam through phase plate focusing system
Author(s): Jinsong Li; Song-lin Zhuang; Yinzhong Xie; Changqing Huang
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Paper Abstract

The evolution of the gradient force pattern of hyperbolic-cosine-Gaussian beams induced by a three-zone pure phase plate is numerically investigated. The pure phase plate consists of three concentric zones—the center circular zone, the inner annular zone—and the outer annular zone and the phase variance of inner annular zone is adjustable. The results show that the proposed plate may induce tunable gradient force on the particles in the focal region. The optical trap shape is obviously tunable and multiple traps may occur with changing geometrical parameters of the phase plate. An optical trap shift can be induced by changing the phase variance of the inner annular zone portion. The phase plate may be a very promising method of transporting trapped particles and can be used to construct controllable optical tweezers.

Paper Details

Date Published: 1 December 2007
PDF: 8 pages
Opt. Eng. 46(12) 124201 doi: 10.1117/1.2819345
Published in: Optical Engineering Volume 46, Issue 12
Show Author Affiliations
Jinsong Li, China Jiliang Univ. (China)
Song-lin Zhuang, Univ. of Shanghai for Science and Technology (China)
Yinzhong Xie, Univ. of Shanghai for Science and Technology (China)
Changqing Huang, China Jiliang Univ. (China)

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