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Proceedings Paper

Optical trapping near a charged surface: three-dimensional optical binding of colloids
Author(s): S. Ahlawat; R. Dasgupta; P. K. Gupta
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Paper Abstract

We report three-dimensional trapping of charge stabilized colloidal particles near a charged surface (glass boundary), using a low numerical aperture objective. The trapping arises due to balancing action between optical forces and electrostatic repulsions. The observation of 3-d colloidal clusters and a linear array of colloidal microspheres along the trap beam and the possible reasons thereof are also discussed.

Paper Details

Date Published: 26 April 2007
PDF: 7 pages
Proc. SPIE 6535, Saratov Fall Meeting 2006: Optical Technologies in Biophysics and Medicine VIII, 65350W (26 April 2007); doi: 10.1117/12.740964
Show Author Affiliations
S. Ahlawat, Raja Ramanna Ctr. for Advanced Technology (India)
R. Dasgupta, Raja Ramanna Ctr. for Advanced Technology (India)
P. K. Gupta, Raja Ramanna Ctr. for Advanced Technology (India)


Published in SPIE Proceedings Vol. 6535:
Saratov Fall Meeting 2006: Optical Technologies in Biophysics and Medicine VIII

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