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Center for Excitonics
Seminar Series
Thurs, Feb 6, 2013
3:00 PM
RLE Haus Room: 36-428
Enhanced Optical Effects from Excitons in Multi-Chromophore Systems
Ted Goodson, Department of Chemistry, University of Michigan
Abstract: Organic conjugated macromolecules have received great attention due
to their use in optical and electronic applications. Certain molecular assemblies have
shown enhanced light harvesting properties by virtue of strong excitonic coupling in the
multi-chromophore system. Organic dendrimers, two-dimensional networks, and circular
macromolecular aggregates have shown properties of strong intra-molecular interactions
which have been utilized in light harvesting processes, photovoltaic (solar) devices,
dielectric effects, as well as for enhanced nonlinear optical effects. This talk will
discuss our basic results and conclusions over the past years utilizing these systems. The
excitation mechanism in these systems depends on the nature of the branching center, the
geometrical orientation of covalently attached chromophores, and the extent of
delocalization. Through steady-state and time-resolved spectroscopy, we have characterized
the mechanism of energy transport and the relative strength of intra-molecular
interactions. In this presentation the photo-physical properties and applications in
optical and electronic devices will be described. For particular assemblies the processes
of efficient energy transfer, fast energy redistribution, and enhanced two-photon
absorption cross-sections will be discussed.
Bio Theodore Goodson III received his B. A. in 1991 from Wabash College and earned
his Ph.D. in Chemistry at the University of Nebraska-Lincoln in 1996. After postdoctoral
positions at the University of Chicago and at the University of Oxford, he accepted a
position as Assistant Professor of Chemistry at Wayne State University in 1998. In 2004 he
moved to the University of Michigan as Professor of Chemistry. In 2008 he was appointed as
the Richard Barry Bernstein Professor of Chemistry at the University of Michigan. Dr.
Goodson's research centers on the investigation of nonlinear optical and
energy transfer in organic multi-chromophore systems for particular optical and electronic
applications. His research has been translated into technology in the areas of two-photon
organic materials for eye and sensor protection, large dielectric and energy storage
effects in organic macromolecular materials, and the detection of energetic (explosive)
devices by nonlinear optical methods. He has investigated new quantum optical effects in
organic systems which have applications in discrete communication systems and sensing.
Light refreshments will be served
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