THz Imaging Arrays: Challenges and Opportunities
Imran MehdiSenior Research Scientist
Jet Propulsion Laboratory
Wednesday, September 25, 2013|
4:30pm - 5:30pm
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About the Event
THz technology can loosely be defined as electrical, optical components and systems that work in the 300-10000 GHz range. In the last few years JPL has led the development of electronic sources and detectors in this frequency range with enabling space instruments to make unprecedented science measurements. Recently we have extended this to demonstrate a source at 2.7 THz that puts out > 10 micro-watts of CW power at room temperature. We have also used THz technology to develop FMCW radars that allow for remote “pat-downs” working at 340 GHz and 670 GHz. THz images from a 340 GHz system are shown below that can detect anomalies beneath winter jackets. The radar is eventually limited by mechanical constraints which can be overcome by using a multi-pixel receiver. Similarly for future space instruments multi-pixel receivers can increase science throughput. However, making heterodyne imaging arrays has a number of challenges. This talk will present a novel approach being pursued in our group that utilizes silicon micro-machine technology along with advanced GaAs and CMOS chips to enable robust and compact array receivers. The talk will focus on presenting some of the challenges and opportunities in developing this technology.
Imran Mehdi (BSEE 1985, MSEE 1986 and Ph.D 1990, University of Michigan) is a Senior Research Scientist at the Jet Propulsion Laboratory, California Institute of Technology. He joined JPL in 1990 and is currently a Group Supervisor in the Instrument Electronics and Sensors Section. His responsibilities include developing THz components, technologies and subsystems for current and future NASA missions. These devices and components were implemented on several space instruments such as MLS, MIRO and HIFI. From 1999 he led the effort of developing broadband solid-state sources from 200 to 2500 GHz for the Heterodyne Instrument for Far Infrared (HIFI) on the Herschel Space Observatory, a cornerstone European Space Agency mission. He is an IEEE Fellow and serves as a topical editor for the IEEE Transactions on THz Science and Technology. His current interests include millimeter and sub-millimeter-wave devices, high-frequency instrumentation, and heterodyne receivers for miniature systems.
Contact: Karla Johsnon
Sponsor: EECS Special Seminar
Open to: Public