讲座人：George C. Schatz，美国科学院院士，美国西北大学大学
讲座时间：2019 年 11月11日上午 10:30
George C. Schatz is Charles E. and Emma H. Morrison Professor of Chemistry at Northwestern University. He received his undergraduate degree in chemistry at Clarkson University and a Ph. D at Caltech. He was a postdoc at MIT, and has been at Northwestern since 1976.
Schatz is a theoretician who studies the optical, structural and thermal properties of nanomaterials, including plasmonic nanoparticles, plasmonic metamaterials, DNA and peptide nanostructures, and carbon-based materials. He has also contributed to theories of dynamical processes, including gas phase and gas/surface reactions, energy transfer processes, transport phenomena and photochemistry.
Schatz has published four books and over 1000 papers. Schatz is a member of the National Academy of Sciences, the American Academy of Arts and Sciences, the International Academy of Quantum Molecular Sciences, and he has been Editor-in-Chief of the Journal of Physical Chemistry since 2005. He has received numerous awards, including the Max Planck Research Award, the Bourke Medal of the Royal Society of Chemistry, the Feynman Prize of the Foresight Institute, the Herschbach Medal, the Debye Award of the ACS, the S F Boys-A Rahman Award of the Royal Society of Chemistry, and the Langmuir Award of the ACS. He is a Fellow of the American Physical Society, the Royal Society of Chemistry, the American Chemical Society and of the AAAS. He is an Honorary Fellow of the Chinese Chemical Society.
This talk will overview research that combines the assembly of arrays of nanoparticles with optics, plasmonics, and excitonics for systems that consist of arrays of gold, silver or aluminum nanoparticles in 1D, 2D and 3D. Two kinds of arrays will be considered, those involving DNA-linked nanoparticles in 3D with subwavelength particle spacings, and those involving 1D/2D arrays of particles where the spacing satisfies a diffraction condition that produces hybrid plasmon-photonic excitations known as lattice plasmons. The emphasis of the DNA—linked nanoparticle structures is on describing scattering and extinction experiments where issues such as effective medium approximations and Fabry-Perot cavity modes are important. I also describe DNA-linked structures whose array dimensions can be modified by adding ethanol or multiply charged ions.
The studies of lattice plasmons include unusual extinction and scattering properties of the lattices that include quadrupole resonance effects for aluminum lattices, and lattice plasmon lasers in which laser dyes are added to the nanoparticle lattices and where the theory needs to combine electrodynamics with a quantum description of the dye photophysics. Also included is a recent study of upconversion nanoparticle emitters that are combined with lattice plasmons to enable CW lasing.