Mar 15, 2013
From staff reports
Physics Professor Alexander Govorov joins an elite group of physicists, having been elected this fall as a fellow in the American Physical Society. At the society's March meeting next week in Baltimore, his research will be on display in three different sessions.
"Being elected a Fellow is a substantial honor, as only 0.5 percent of the membership of each division receives this honor annually," notes D.A. Drabold, Distinguished Professor of Physics.
"Dr. Govorov is incredibly productive, and this is a most fitting honor! Sasha is a theorist that many experimentalists have delighted at working with for his insight into physical phenomena," says David Ingram, chair of Physics and Astronomy in the Ohio University College of Arts and Sciences.
Govorov joins a long, distinguished line of APS fellows in the department. Ohio faculty elected as fellows include Carl Brune, David Drabold, Charlotte Elster, Ken Hicks, Peter Jung, Daniel Phillips, Madappa Prakash and Sergio Ulloa.
The American Physical Society citation notes that Govorov was elected "for contributions to the understanding of optical properties of semiconductor and metal nanostructures, including elucidation of the optical Aharonov-Bohm and nonlinear Fano effects."
At the American Physical Society's March Meeting 2013 in Baltimore March 18-22, Govorov and his Ohio University Ph.D. students are presenting several papers.
In Session R22 on plasmonics and optical interactions in structured materials, Govorov and Hui Zhang, a postdoctoral researcher in his lab, and their co-authors "investigate theoretically the effects of exciton-plasmon interaction and plasmon-assisted carrier injection in a hybrid semiconductor-metal nanostructure under resonant optical excitation."
Their results, R22.00008: Exciton-plasmon interaction and photo-injection of plasmonic hot carriers in hybrid nanostructures, "can be used to design and describe a variety of plasmonic nanodevices with hot electron injection for photo-catalysis, light-harvesting, and solar cells," according to their abstract.
In Session B22 on nanoparticles, wires and cavities, Ohio Professor Govorov and Ph.D. student Zhiyuan Fan present B22.00001 Optical properties and circular dichroism of chiral metal nanoparticles. Their abstract notes that "in nature, biological systems are built up by homochiral building blocks, such as a sugar and protein. Circular dichroism (CD) is an eﬀective tool of resolving molecular conformations. It utilizes circularly polarized light to detect diﬀerential absorption of chiral materials. In medicine, it will help us to develop new drugs and therapies, if we understand the connection between the physical or chemical properties of drug molecules and their conformations…. Here we present a plasmonic CD mechanism from a single chiral metal nanocrystal….Chiral metal nanocrystals are expected to have promising applications in biosensing."
In Session N38 on novel photophysics and transport in NanoPV1, Govorov is a co-author on N38.00003: Phonon-assisted nonradiative energy transfer in quantum dot-silicon nanostructures. "Silicon is one
of the most dominant materials in photovoltaics and understanding the processes of energy transfer is of great importance. In this work, we study the phonon-assisted nonradiative energy transfer (NRET) in quantum dot (QD)-silicon hybrid nanostructures," according to their abstract.
"We propose a theoretical model based on the phonon-assisted energy transfer process. We estimate the energy transfer rate using the Fermi's Golden rule where the matrix elements are derived for the phonon-assisted energy transfer process."