Dynamic stereo microscopy for studying particle sedimentation

We demonstrate a new method for measuring the sedimentation of a single colloidal bead by using a combination of optical tweezers and a stereo microscope based on a spatial light modulator. We use optical tweezers to raise a micron-sized silica bead to a fixed height and then release it to observe i...

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Bibliographic Details
Published in:Optics express 2014-02, Vol.22 (4), p.4671-4677
Main Authors: Lee, M P, Gibson, G M, Phillips, D, Padgett, M J, Tassieri, M
Format: Article
Language:English
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Summary:We demonstrate a new method for measuring the sedimentation of a single colloidal bead by using a combination of optical tweezers and a stereo microscope based on a spatial light modulator. We use optical tweezers to raise a micron-sized silica bead to a fixed height and then release it to observe its 3D motion while it sediments under gravity. This experimental procedure provides two independent measurements of bead diameter and a measure of Faxén's correction, where the motion changes due to presence of the boundary.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.22.004671