Levich Institute Seminar Announcement, 11/02/2004

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Tuesday, 11/02/2004
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor David G. Grier
New York University
Department of Physics and Soft Matter Research

"Transforming Mesoscopic Matter with Holographic Optical Traps"


Optical trapping is an increasingly important technique for controlling and probing matter at length scales ranging from nanometers to millimeters. This talk covers new methods for creating large numbers of high-quality optical traps in arbitrary three-dimensional configurations and for dynamically reconfiguring them under computer control. In addition to forming conventional optical tweezers, these holographic methods also can sculpt the wavefront of each trap individually, allowing for mixed arrays of traps based on exotic modes of light, including optical vortices, axial line traps, optical bottles, and optical rotators. The ability to establish large numbers of individually structured optical traps and to move them independently in three dimensions presents exciting new opportunities for fundamental research and commercial applications. As particular applications, we will focus on continuous fractionation of colloidal particles in large arrays of optical tweezers, and on the self-organization of micro- and nanofluidic pumps in holographic arrays of optical vortices.