Grier, Faculty Advisor, David G.

Korda, Faculty Advisor, Pamela T.

Sheets, \u2701, Steven A.

Spalding, Facutly Advisor, Gabriel C.

Digital Commons @ Illinois Wesleyan University

Illinois Wesleyan UniversityDigital Commons @ IWUJohn Wesley Powell Student ResearchConference 2001, 12th Annual JWP ConferenceApr 21st, 2:00 PM - 3:00 PMIncursion of Colloid into an Optical PinscapeSteven A. Sheets, '01Illinois Wesleyan UniversityGabriel C. Spalding, Facutly AdvisorIllinois Wesleyan UniversityPamela T. Korda, Faculty AdvisorThe University of ChicagoDavid G. Grier, Faculty AdvisorThe Unversity of ChicagoFollow this and additional works at: http://digitalcommons.iwu.edu/jwprcThis Event is brought to you for free and open access by The Ames Library, the Andrew W. Mellon Center for Curricular and FacultyDevelopment, the Office of the Provost and the Office of the President. It has been accepted for inclusion in Digital Commons @ IWU bythe faculty at Illinois Wesleyan University. For more information, please contact digitalcommons@iwu.edu.©Copyright is owned by the author of this document.Steven A. Sheets, '01; Gabriel C. Spalding, Facutly Advisor; Pamela T. Korda, Faculty Advisor; and David G. Grier,Faculty Advisor, "Incursion of Colloid into an Optical Pinscape" (April 21, 2001). John Wesley Powell Student ResearchConference. Paper 5.http://digitalcommons.iwu.edu/jwprc/2001/posters2/5THE ,JOHN WESLEY POWEll STIJDENT RESEARCH CONFERENCE . APRil 2001 Poster Presentation 22 INCURSION OF COLLOID INTO AN OPTICAL PINS CAPE Steven A. Sheets(l), Gabriel C. Spalding*(l), Pamela T. Korda*(2), and David G. Grier*(2) (l)Department of Physics, lllinois Wesleyan University (2)Dept. of Physics, James Franck Institute, and Institute for Biophysical Dynamics The University of Chicago When subjected to an applied extemal field higher than some critical value, quantum vortices enter a type II superconductor, but spread out due to repulsive vortex-vortex interactions. Others in our lab' have recently begun to study the behavior of vortex matter in superconductors that have been patterned so as to contain an array of pinning centers. This patterning introduces a static 'landscape' of potential energy, and a competition between vortex-vortex interactions and vortex-pinscajJe interactions. While this problem has important teclmological implications, it is also an interesting system for the study of collective behaviors in many-body assemblies. Korda and Spalding have performed an experiment that serves as a classical analog of such interactions. A holographic optical tweezing was used to create an optical pinscape for colloidal particles. By initiating a convection roll on the far side of their sample cell, they created an external influence that tends to drive the colloid into the pinscape. Here, we present an analysis of the optical potential and of the evolution of the colloid as it invades the optical pinscape. We also explore the similarities and differences between this experiment and the one involving quantum vortices. 'Brad Andrews, Paul Curran, Gabriel C. Spalding, "Magnetic Dot and Anti-Dot Array Fabrication via Nanosphere Physical Masks," John Wesley Powell Research Conference, 2001 

Incursion of Colloid into an Optical Pinscape

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Incursion of Colloid into an Optical Pinscape

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