26 April 2007 Optical trapping near a charged surface: three-dimensional optical binding of colloids
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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.
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S. Ahlawat, R. Dasgupta, P. K. Gupta, "Optical trapping near a charged surface: three-dimensional optical binding of colloids", Proc. SPIE 6535, Saratov Fall Meeting 2006: Optical Technologies in Biophysics and Medicine VIII, 65350W (26 April 2007); doi: 10.1117/12.740964; https://doi.org/10.1117/12.740964
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