CASA Seminar
The terahertz frequency band, spanning from about 100 GHz through 10 THz, is
often described as the least explored yet most scientifically rich region of
the electromagnetic spectrum. Since the early 1970s the University of Virginia
Semiconductor Device Laboratory has worked to create a technology base suitable
to explore and exploit this spectral range. The initial applications of this
research were chemical spectroscopy, radio astronomy and atmospheric studies.
More recent applications include compact range radars, plasma and accelerator
diagnostics and studies of solid surfaces. Future applications may include
collision avoidance radar, ultra wideband communications, detection of chemical
and/or biological hazards and medical diagnostics.
This talk will describe two important aspects of our current research. The
first is the recent measurement of the THz spectra of biological macromolecules.
This study, carried out by Dr. T. Globus under support from D. Woolard of the
U.S. Army, has focused on initial measurements of macroscopic samples of DNA
from a variety of species. The results have indicated that clear spectral features
are present and that the signals can be used to differential between species.
However, the measurement of these signals requires extremely careful sample
preparation as well as careful measurement techniques. The second aspect of
this talk describes the development of an all-solid-state terahertz technology
base that is suitable for the wide range of experiments and applications that
are now envisioned. Specific recent accomplishments include the development
of compact terahertz sources that are electronically tunable over full waveguide
bands. This new technology is based on a new GaAs-on-quartz integration
technology that has been pioneered at UVa.
Talk Slides:
PDF
(Coffee & Cookies before the seminar starting 2:30 PM)