title: Dynamic stereo microscopy for studying particle sedimentation.
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.
authors.forename: M P
authors.initials: MP
authors.lastname: Lee
authors.forename: G M
authors.initials: GM
authors.lastname: Gibson
authors.forename: D
authors.initials: D
authors.lastname: Phillips
authors.forename: M J
authors.initials: MJ
authors.lastname: Padgett
authors.forename: M
authors.initials: M
authors.lastname: Tassieri