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Seminar - "Recent Advances in TeraHertz Devices"

Title of Part I: THz overview, plasmonic nanotransistor for THz (direct and heterodyne) detection and tunable emission: theory, modelling and experiments.
Title of Part II: TeraLab Overview, Nitride based quantum wells: new physical phenomena for THz amplification/emission. Ultrafast terhertz wireless communication using plasmonic devices.


The TeraHertz (THz) frequency range lies from 100 GHz to 10 THz, which corresponds to wavelengths between 3 mm and 30 µm. Previously known as the Far Infrared Range, it represents an underused part of the electromagnetic spectrum. However THz radiation has a great number of potential applications in several domains: high-resolution spectroscopy in physics (THz time domain spectroscopy, study of electron dynamics, interaction with phonons, impurities, etc.), in chemistry (gas detection, pollution and environment control, study of chemical reactions, etc…), in astronomy (study of galaxies, detection of gas, atoms and ionized molecules, ...), in telecommunications (wireless and broadband networks, short range networks, radars), in industrial imaging (inspection of materials, devices and systems), in medicine (detection of caries, oncology, diagnostic of burns), in biology (water detection, food industry), in security (detection of weapons and dangerous materials). Therefore the realization of devices able to operate at these frequencies represents one of the greatest challenges of both modern electronics and optoelectronics since this domain is well above the typical frequencies of microwave electronics and, at the same time, well below the typical frequencies of optical and infrared lasers. At present, there is a huge international effort to develop low-cost, reliable, compact and tunable sources, able to operate continuously at room temperature and compatible with the standard technological dies to achieve easy integration in complex systems and circuits.

Speaker Biographical Sketch

Dr. Jeremie Torres is an Associate Professor in the Institute of Technology-Applied Physic at the University of Montpellier. He received the MSc degree in 2001 and the Ph.D. in applied physics (Nanophotonics) from Montpellier University, France, in 2004. From 2004 to 2005 he joined the Laboratory for Photonics and Nanostructures in Paris in 2004 as a Postdoctoral Fellow. In 2005, he joined the Institute of Southern Electronics laboratory as Postdoc then as Assistant Professor. Dr. Torres’s current research focuses on experiments of electronic transport in semiconductor materials and nanodevices in on out-of-equilibrium regime for generation, detection and applications of terahertz radiations via new physical current instabilities at terahertz frequency (plasma, Gunn, optical-phonon, etc...). He has authored over 30 publications and 40 communications.

Luca Varani received the Ph.D. degree in physics from the University of Modena (Italy) in 1993, and the Ph.D. degree in electronics from the University of Montpellier (France) in 1996. He is currently a Professor at the Institute of Electronics of the South, University of Montpellier 2 (France) where he is responsible of the High-Frequency Investigation Group. Since 2010 he is director of TeraLab-Montpellier. His current research interests include high-frequency transport and noise properties of semiconductor materials and devices. He is the coauthor of about 300 scientific articles published in refereed journals and conference proceedings.

Date: 20 May 2011 (Friday)
Time: Part I : 2:30pm – 3:30pm
Part II : 4:00pm – 5:00pm
Venue: B6605, 6/F, Academic Bldg, City University of Hong Kong,
83 Tat Chee Avenue, Kowloon Tong, Kowloon,
Hong Kong.
Language: English

For seat reservation, please fax the Registration Form to (852)-2788 7579 on / before 18 May 2011.