Speaker: Dr. Ehsan Afshari
PhD, Associate professor,
Department of Electrical and Computer Engineering,
Cornell University
Local Organizer: Dr. Omidi
Title: Terahertz: The Last Untapped Spectrum
Time: Wednesday 17 December 2014.
Location: Ionic seminar room, School of Electrical Engineering and Computer, Isfahan University of Technology.
Abstract:
There is an increasing interest in low cost THz systems for medical imaging, spectroscopy, and high data rate communication. Recent results in the lower THz frequencies (<600 GHz) suggests that a standard CMOS process can compete with compound semiconductors for some applications. In this talk, after a brief introduction to our research group at Cornell, we present a few “real†applications for the CMOS THz systems as well as a few “fake†ones. Next, we discuss major challenges in realizing these systems in CMOS. Moreover, we show several novel methods to overcome these challenges to generate mW-level powers at 300-500 GHz with relatively low noise using oscillators, amplifiers, and frequency multipliers. Finally, we show how similar approaches can result in >100 mW at 500 GHz using GaN HEMT devices.
Biography:
Ehsan Afshari was born in 1979. He received the B.Sc. degree in Electronics Engineering from the Sharif University of Technology, Tehran, Iran and the M.S. and Ph.D. degree in electrical engineering from the California Institute of Technology, Pasadena, in 2003, and 2006, respectively. In August 2006, he joined the faculty in Electrical and Computer Engineering at Cornell University. His research interests are mm-wave and terahertz electronics and low-noise integrated circuits for applications in communication systems, sensing, and biomedical devices.
Prof. Afshari serves as the chair of the IEEE Ithaca section, as the chair of Cornell Highly Integrated Physical Systems (CHIPS), as a member of International Technical Committee of the IEEE Solid-State Circuit Conference (ISSCC), as a member of the Analog Signal Processing Technical Committee of the IEEE Circuits and Systems Society, as a member of the Technical Program Committee of the IEEE Custom Integrated Circuits Conference (CICC), and as a member of Technical Program Committee of the IEEE International Conference on Ultra-Wideband (ICUWB).
He was awarded National Science undation CAREER award in 2010, Cornell College of Engineering Michael Tien excellence in teaching award in 2010, Defense Advanced Research Projects Agency (DARPA) Young Faculty Award in 2008, and Iran’s Best Engineering Student award by the President of Iran in 2001. He is also the recipient of the best paper award in the Custom Integrated Circuits Conference (CICC), September 2003, the first place at Stanford-Berkeley-Caltech Inventors Challenge, March 2005, the best undergraduate paper award in Iranian Conference on Electrical Engineering, 1999, the recipient of the Silver Medal in the Physics Olympiad in 1997, and the recipient of the Award of Excellence in Engineering Education from Association of Professors and Scholars of Iranian Heritage (APSIH), May 2004.