"Nanoscale
Plasmonic Heterostructures"
Friday,
October 27, 2006
3:30 PM
Birck Nanotechnology Center, Room 1001
Gary P.
Wiederrecht
Chemistry
Division and Center for Nanoscale Materials
Argonne National
Laboratory, Argonne, Illinois 60439-4831
Surface
plasmons are electromagnetic modes that are present at the interface
of a metal and dielectric material. Depending upon the structure of
the metal, surface plasmons demonstrate a wide range of
characteristics, such as optical field enhancements, tunable
resonances, and the ability to propagate in films or be confined at
nanoparticle defects. As a result, surface plasmons continue to
generate growing interest for new sensor technologies, energy
transport, and photonics applications. In many cases, the most
interesting advantages of surface plasmons lie in the optical
near-field, significantly below the diffraction limit of conventional
optics in at least one dimension. This requires novel methods for
imaging the spatial profile and propagation properties of surface
plasmons, as well as novel spectroscopies for studying photochemistry
of heterostructured materials in the near-field. In this talk, recent
efforts in our group for the imaging and spectroscopy of plasmonic
heterostructures are discussed. Specific examples include plasmonic
continuum spectroscopy, metal nanoparticle photoluminescence, the use
of photoresponsive polymers for near-field optical imaging, and
coherent coupling of molecular excitons to surface plasmons.
Gary Wiederrecht, received a B.S. in chemistry in 1987 from the
University of California, Berkeley and a Ph.D. in physical chemistry
from the Massachusetts Institute of Technology in 1992. His thesis
research was in the area of ultrafast pulseshaping and spectroscopy of
soft phonon modes in organic and inorganic ferroelectric crystals. He
joined Argonne as a postdoctoral fellow in 1992, and in 1995 became a
staff member specializing in ultrafast spectroscopy of photoinduced
electron transfer reactions. He is currently a Chemist and Group
Leader of the Nanophotonics Group in the Chemistry Division and Acting
Group Leader of the Nanophotonics Group in the Center for Nanoscale
Materials. His current research is focused on the near-field and
far-field spectroscopies of metallic and hybrid organic-metallic
nanostructures, with an emphasis on their nanophotonic and charge
storage capabilities.
Host: Vladimir Shalaev/Samuel Gresillion ECE Department, (49855,
shalaev@purdue.edu)
SPONSORED BY:
Birck Nanotechnology
Center, Bindley Bioscience Center, Discovery Park, The NASA Institute
for Nanoelectronics and Computing, The Network for Computational
Nanotechnology, VEECO, NCN Student Leadership Council, Department of
Chemistry, Department of Physics, School of Chemical Engineering,
School of Electrical and Computer Engineering, School of Mechanical
Engineering
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Annie Cheever, Area
Secretary
School of Electrical and Computer
Engineering
acheever@purdue.edu
Purdue University
Birck Nanotechnology Center, Room 2027
1205 West State Street
West Lafayette, IN 47907-2057
Phone: 765-496-8327 Fax:
765-496-6443 http://www.nano.purdue.edu/
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