Electrical and Computer Engineering
Richard E. Smalley Institute for Nanoscale Science and Technology
Assistant Professor, Department of Electrical Engineering and Computer Science
University of Michigan, Ann Arbor
mm-Wave, THz, and Infrared Seminar Series
Friday, October 18, 2013
Pushing the Limits of Terahertz Optoelectronics
to 10:30 AM
3076 George R. Brown Hall
6100 Main St
Houston, Texas, USA
Although unique potentials of terahertz waves for chemical identification, material characterization, biological sensing, and medical imaging have been recognized for quite a while, the relatively poor performance, higher costs, and bulky nature of current terahertz systems continue to impede their deployment in field settings. In this talk, I will describe some of our recent results on developing fundamentally new terahertz electronic/optoelectronic components and imaging/spectrometry architectures to mitigate performance limitations of existing terahertz systems.
In specific, I will introduce new designs of high-performance photoconductive terahertz sources that utilize plasmonic antennas to offer terahertz radiation at record-high power levels of several milliwatts – demonstrating more than three orders of magnitude increase compared to the state of the art. I will describe that the unique capabilities of these plasmonic antennas can be further extended to develop terahertz detectors and heterodyne spectrometers with single-photon detection sensitivities over a broad terahertz bandwidth at room temperatures, which has not been possible through existing technologies. To achieve this significant performance improvement, plasmonic antennas and device architectures are optimized for operation at telecommunication wavelengths, where very high power, narrow linewidth, wavelength tunable, compact and cost-effective optical sources are commercially available. Therefore, our results pave the way to compact and low-cost terahertz sources, detectors, and spectrometers that could offer numerous opportunities for e.g., medical imaging and diagnostics, atmospheric sensing, pharmaceutical quality control, and security screening systems. And finally, I will briefly highlight our research activities on development of new types of high-performance terahertz passive components (e.g., modulators, tunable filters, and beam deflectors) based on novel reconfigurable meta-films.
Host: Aydin Babakhani, Junichiro Kono, Daniel Mittleman
Biography of Mona Jarrahi:
Mona Jarrahi received her Ph.D degree in Electrical Engineering from Stanford University in 2007 and served as a Postdoctoral Scholar at University of California Berkeley from 2007 to 2008. After serving as an Assistant Professor in University of Michigan Ann Arbor, she is joining UCLA in Fall 2013 as an Associate Professor of Electrical Engineering and the Director of the Terahertz Electronics Laboratory. Her research group focuses on Terahertz/Millimeter-Wave Electronics and Optoelectronics, Imaging and Spectroscopy Systems, and Microwave Photonics.
Prof. Jarrahi has received several prestigious awards in her career including the Grainger Foundation Frontiers of Engineering Award from National Academy of Engineering; Young Investigator Awards from the Army Research Office (ARO), the Office of Naval Research (ONR), and the Defense Advanced Research Projects Agency (DARPA); Early Career Award from the National Science Foundation (NSF); the Elizabeth C. Crosby Research Award from the University of Michigan; and best-paper awards at the International Microwave Symposium.
Prof. Jarrahi is a member of the editorial board of Journal of Infrared, Millimeter and Terahertz Waves and a member of the program committee of the International Conference on Infrared, Millimeter, and Terahertz Waves, IEEE International Microwave Symposium, International Workshop on Optical Terahertz Science and Technology, IEEE International Symposium on Antennas and Propagation, SPIE Photonics West Conference, and SPIE Optics + Photonics Conference. She also serves as a panelist and reviewer for National Science Foundation and Department of Energy and a member of the Terahertz Technology and Applications Committee of IEEE Microwave Theory and Techniques Society. Prof. Jarrahi is a senior member of IEEE and SPIE and a member of OSA.