MIOMD-XI Speakers    
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1.  Prof. Ben Williams, University of California Los Angeles, USA
Invited Talk: Terahertz quantum-cascade lasers based on transmission-line metamaterial waveguides
Speaker Biography: Benjamin S. Williams: Prof. Williams received the Ph.D. degree from the Massachusetts Institute of Technology, Cambridge, Massachusetts in 2003 in Electrical Engineering and Computer Science. He was a Postdoctoral Associate at the Research Laboratory of Electronics at MIT from 2003-2006. In 2007, he joined Electrical Engineering Department at the University of California, Los Angeles, where he is currently an Assistant Professor, and is a Henry Samueli School of Engineering and Applied Sciences Fellow. His research interests include quantum cascade lasers, intersubband and intersublevel devices in semiconductor nanostructures, and terahertz metamaterials and sub-wavelength plasmonics. He is the recipient of the DARPA Young Faculty Award and the NSF CAREER award.

Summary: The paradigm for composite right/left handed (CRLH) transmission line metamaterials developed in the microwave can be adapted to the THz frequency range and implemented in THz quantum-cascade (QC) laser metal-metal waveguide. Loading of the waveguide with inductive and capacitive structures enables engineering of the dispersion relation to achieve forward and backward wave propagation. The feasibility of using CRLH THz waveguides for both active leaky-wave antennas and QC-laser cavities is discussed.
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