Levich Institute Seminar Announcement, 11/02/2010
Tuesday, 11/02/2010
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor Daniel Ou-Yang
Lehigh University
Department of Physics

"Ensemble Behavior of Nanoparticles in Optical Confinement"


A novel method, optical bottles, will be described for analysis of the collective behavior of nanoparticles in optical confinement at the focus of a laser beam. Consideration of the mechanical force balance between repulsive osmotic and confining gradient-force pressures yields the single-particle trapping potential and the interactions between the particles. The ensemble nature of the measurement permits determination of single-particle trapping energies much smaller than /k_B T/. The ability to imaging the nanoparticle ensembles in 3-D also provides a means to map the optical field in space.

  • 1985 Ph.D. Physics, UCLA
  • 1985 88 Postdoctoral Fellow, University of Pennsylvania
  • 1994 - 00 Associate Professor of Physics, Lehigh University
  • 1999 - 00 Visiting Research Scientist, CNRS Laboratoire de Dynamique des Fluides, Complexes, Strasbourg, France
  • 2000 - Professor of Physics, Lehigh University
  • 2001 - 03 Funding co-director, Bioengineering Program
  • 2003 - 10 Associate Director, Bioengineeirng Program
  • 2005 - Team Leader, Biophotonics, Center for Optical Technologies
  • 1988 94 Assistant Professor of Physics, Lehigh University
  • 2008 Visiting professor, Hong Kong University of Science and Technology
  • 2008 Visiting professor, National Taiwan University, Taipei
  • 2008 Visiting professor, Korea Advanced Institute of Science and Technology
  • 2009-Present Director, Emulsion Polymers Institute


Soft matter, colloids and biological physics