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Proceedings Paper

Multiple doughnut beams for trapping and dynamic manipulation of low-index microstructures
Author(s): Vincent Ricardo Daria; Peter John Rodrigo; Jesper Gluckstad
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Paper Abstract

We demonstrate the use of independently controlled doughnut beams for trapping and manipulation of an array of low-index microstructures. These types of particles are generally difficult to handle using conventional optical traps due to the inverse effect of the gradient force, which repels the particles from the region of stronger light intensity. The configurable multiple doughnut beams are generated using a nearly loss-less phase-to-intensity conversion of a phase-encoded collimated coherent light source. The two-dimensional phase distribution corresponding to the optical trap pattern is encoded using a computer-programmable spatial light modulator enabling each trap to be moved arbitrarily along the transverse direction. Experiments show trapping and manipulation of hollow “air-filled” glass micro-spheres suspended in aqueous medium.

Paper Details

Date Published: 1 July 2004
PDF: 8 pages
Proc. SPIE 5322, Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues II, (1 July 2004); doi: 10.1117/12.528953
Show Author Affiliations
Vincent Ricardo Daria, Riso National Lab. (Denmark)
Peter John Rodrigo, Riso National Lab. (Denmark)
Jesper Gluckstad, Riso National Lab. (Denmark)

Published in SPIE Proceedings Vol. 5322:
Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues II
Dan V. Nicolau; Joerg Enderlein; Robert C. Leif; Daniel L. Farkas, Editor(s)

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