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faculty
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Theodore
Goodson, III Professor
of Chemistry
Ph.D., University of Nebraska
Postdoctoral, University of Chicago and University of Oxford
Physical
Chemistry , Organic Materials, Nonlinear and Time-resolved
Spectroscopy, Quantum Optical Effects
in Novel Materials
Phone: (734) 647-0274
E-mail: tgoodson@umich.edu
Research Group |
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Our
Research group utilizes a number of spectroscopic
techniques towards investigating the optical properties
and applications of novel organic macromolecular
materials. A major emphasis is placed on the new
properties observed in organic macromolecules with
branching repeat structures as well as organic
macromolecules encapsulated with small metal particles.
These materials have been suggested to be candidates
for variety of applications involving light emitting
devices, artificial light harvesting, strong optical
limiters, enhanced nonlinear optical effects, quantum
optical effects and as sensors in certain organic
and biological devices.
Utilizing
steady-state spectroscopy as well as ultra-fast
time-resolved fluorescence (Upconversion) and
absorption (pump-probe) measurements our research
is focused on probing the kinetics of the fast
energy redistribution processes that occur in branched
(and related) macromolecular structures. With the
additional use of fluorescence anisotropy decay
measurements, we have characterized the fundamental
limits of interaction in different molecular architectures.
Investigations of novel larger branched structures
(obtained through collaboration) as well as more
fundamental investigations (were the synthesis
of model compounds is carried in our lab) are
used to probe the important structure-function
relationships in these systems. These investigators
are coupled with measurements of interactions and
electronic dephasing in the branched (aggregate)
systems with 3-pulse photon echo spectroscopy (3PEPS).
This combined approach allows for the analysis
of the energy transfer, interaction strength, dephasing,
as well as other important physical properties
of particular macromolecular systems.
The
research in the group is also directed at the
use of organic branched structures for applications
in nonlinear optics as well as quantum optical
and quantum interference effects. The investigations
of strong interactions in particular multi-chromophore
systems suggest that there is a possibility
of enhanced transition dipole moments. This has
been observed in organic branched structures
in our laboratory. New methods, both synthetically
and optically to enhance the nonlinear response
of organic
branched macromolecules are developed in this research
effort. These measurements are combined with two-photon-emission
and degenerate-four-wave mixing experiments to
fully characterize the complete response of novel
materials.
The
initial investigations utilizing organic materials
in quantum optical phenomena were carried out
in our laboratory. This included measurements
of photon number
squeezed states of light in an organic polymeric
material. The ability to reduce the photon fluctuation
below the shot-wave limit is of significant use
to those interested in an all optical telecommunication
system. The striking result was that the organic
material gave rise to the same magnitude of " squeezed
light" as was observed for inorganic systems with
interactions lengths that was orders of magnitude
longer. Our recent investigations in this area
include measurements of entangled photon and their
use in the spectroscopy of organic materials at
low photon-number as well as other novel quantum
interference effects with organic materials.
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AWARDS
- Lloyd
Ferguson Young Scientist Award (NOBCCHE)
- Alfred
P. Sloan Foundation Fellow
- Camille
and Henry Dreyfus Foundation Teacher-Scholar
Award
- National
Science Foundation CAREER Award
- Army
Research Office Young Investigator Award
- Burroughs
Welcome Fund Travel Award
- National
Research Council Ford Fellowship, University
of Oxford, Oxford, UK
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REPRESENTATIVE PUBLICATIONS
- Guo, Meng ; Yan, Xingzhong; Kuon,
Young; Hayakawa, Teruoki; Kakimoto, Maso-aki; Goodson,
Theodore, III. High Frequency dielectric response
in a branched phthalocyanine J. Am. Chem. Soc. (2006),
128(46); 14820-14821.
- Bhaskar, Ajit; Ramakrishna, Guda;
Haley, Michael M; Goodson, Theodore, III. Building
symmetric two-dimensional two-photon materials J.
Am. Chem. Soc. (2006), 128, 13972
- Dong-Ik Lee and
Theodore Goodson III. Entangled Photon Absorption
in an Organic Porphyrin Dendrimer . J.Phys. Chem.
B, 110 (51): 25582-25585 DEC 28 2006
- Ying Wang and
Theodore Goodson III . Early Aggregation in Prion
Peptide Nanostructures Investigated by Nonlinear
and Ultra-fast Time-Resolved Fluorescence Spectroscopy
J. Phys. Chem. B, Letters, 2007, 111(2), 327-330.
- Varnavski,
Oleg P.; Ranasinghe, Mahinda; Yan, Xingzhong; Bauer,
Christina A.; Chung, Sung-Jae; Perry, Joseph W.;
Marder, Seth R.; Goodson, Theodore, III. Ultrafast
Energy Migration in Chromophore Shell-Metal Nanoparticle
Assemblies. J. Am. Chem. Soc. (2006), 128(34), 10988-10989.
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