Dr. Andrea Markelz
Professor, Ph.D. UC Santa Barbara (1995)
Office: 130 Fronczak Hall, (716) 645-2739
Lab: 129 Fronczak Hall, (716) 645-2590
Lab: 129A Fronczak Hall (716) 645-2576
link to personal website for more info
Ph.D. -- University of California, Santa Barbara (1995)
B.A. -- University of California, Berkeley (1987)
- Biophotonic, electro-optic and spintronic materials: ultrafast optical
and terahertz studies
Research is underway to develop and understand novel optical and
electronic materials to enable the technologies of all optical
computing, spintronic devices and quantum computing. These efforts
include biophotonic materials, electro-optic materials and
ferromagnetic semiconductor materials.
The technological revolution of the 20th century was based on
semiconductor technology; however, limitations in size and function
are rapidly approaching. As an alternative, the optical and electrical
properties of biosystems, their emerging tailorability through
mutagenisis and their ability to self assemble into regular periodic
structures, has created a new materials science field based on
biosystems. We are investigating photoactive proteins and the
interface between biomolecules and conventional semiconductor
systems through ultrafast optical/terahertz studies. In addition to the
technological applications, these studies of the relationship between
molecular conformational dynamics and biological function will
contribute to the understanding of signal transduction in biological
systems. This research is part of an NSF interdisciplinary doctoral
fellowship program (IGERT) at UB
In order to realize all optical computing, optical equivalents to
electronic components are being developed. These include logic,
storage and routing elements based on electro-optic materials. The
response of these materials is determined by the conformational
dynamics of the crystalline structures. We measure the ultrafast
dynamics of electro optic and ferroelectric nanoparticle materials
developed at the Institute for Lasers, Photonics and Biophotonics at
the University at Buffalo (http://www.photonics.buffalo.edu/).
Adding the control of the spin state in electronic systems opens
new avenues for electronic and optical devices. Among these
applications are three state logic, optical computing and quantum
computing. Such spin state control could be realized by ferromagnetic
semiconductor materials. We are studying the high frequency
transport properties of these materials to determine the nature of
electronic response in these novel 2D systems.
- "Terahertz Time domain spectroscopy of the M intermediate state of Bacteriorhodopsin", S. Whitmire, A. G. Markelz, J. R. Hillebrecht, and R. Birge, Proceedings of the 26th International Conference on Infrared and Millimeter Waves, Toulouse, France Sept. 10-14 2001
- "Pulsed Terahertz Spectroscopy of DNA, Bovine Serum Albumin and Collagen between 0.06 to 2.00 THz", A. G. Markelz, A. Roitberg, and E. J. Heilweil, Chem. Phys. Lett. 320, 42 (2000).
- "Temperature Dependent THz Output from Semi-Insulating GaAs Photoconductive Switches", A. G. Markelz and E. J. Heilweil, Appl. Phys. Lett. 72, 2229 (1998).
- "Energy relaxation time in InAs/Al1-xGaxSb quantum wells", A. G. Markelz, N. G. Asmar, E. G. Gwinn, and Berinder Brar, Appl. Phys. Lett. 72, 2439 (1998).
- "Impact Ionization in InAs quantum wells with Far Infrared illumination", A. G. Markelz, N. G. Asmar, E. G. Gwinn, and Berinder Brar, Appl. Phys. Lett. 69, 3975 (1996).