Dynamic stereo microscopy for studying particle sedimentation

Lee, M.P., Gibson, G.M. , Phillips, D., Padgett, M.J. and Tassieri, M. (2014) Dynamic stereo microscopy for studying particle sedimentation. Optics Express, 22(4), pp. 4671-4677. (doi: 10.1364/OE.22.004671)

Abstract

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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Gibson, Dr Graham and Lee, Mr Michael and Padgett, Professor Miles and Tassieri, Dr Manlio and Phillips, Dr David
• Authors: Lee, M.P., Gibson, G.M., Phillips, D., Padgett, M.J., and Tassieri, M.
• College/School: College of Science and Engineering > School of Physics and Astronomy; College of Science and Engineering > School of Engineering > Biomedical Engineering
• Journal Name: Optics Express
• Publisher: Optical Society of America
• ISSN: 1094-4087
• ISSN (Online): 1094-4087
• Copyright Holders: Copyright © 2014 Optical Society of America
• First Published: First published in Optics Express 22(4):4671-4677
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher