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The Wonders of Technology May 4-7, 2008
Sheraton Fallsview
Niagara Falls
Ontario, Canada

Plenary 2: Negative-Refractive-Index Transmission-Line (NRI-TL) Metamaterials And Their Applications

Monday, May 5, 2008
8:15 a.m.
Oakes Ballroom

Presented by

Prof. George V. Eleftheriades
Canada Research Chair in Nano-structured Materials
Velma M. Rogers Graham Chair in Engineering Department of Electrical and Computer Engineering, University of Toronto, Waterloo, Ontario, Canada


Recently there has been renewed interest in artificial materials with electromagnetic properties that cannot be found in nature. Therefore these materials are referred to as “metamaterials” (“meta” means “beyond” in Greek). This lecture mainly addresses metamaterials that are characterized by a negative refractive index. The feasibility of media that simultaneously exhibit negative permittivity and negative permeability, hence a negative refractive index, has been known since the sixties. However it is only recently that people invented ways to realize them. In such negative-refractive-index (NRI) or “left-handed” metamaterials, waves can be thought of as propagating backward instead of forward. When interfaced with conventional dielectric materials, incident waves become focused on a point instead of diverging outwards, thus suggesting the implementation of lenses with flat surfaces. In this presentation, first the fundamental properties of NRI metamaterials will be reviewed. Subsequently, it will be demonstrated that NRI metamaterials can be synthesized using planar networks of loaded transmission lines (TL). The resulting NRI-TL metamaterials can be easily constructed using embedded capacitors and inductors, and they offer wide operating bandwidths and low insertion losses. The extension of these media to 3D isotropic and related volumetric NRI-TL metamaterials will also be discussed. Based on this approach, microwave NRI metamaterial lenses that can resolve details beyond the classical diffraction limit will be presented. Moreover, a number of useful antenna and microwave devices, enabled by such NRI-TL metamaterials will be demonstrated. Finally some futuristic applications of metamaterials, such as cloaking, will be described. These enabling materials and devices can find applications in diverse areas such as emerging broadband wireless communications, defence, medical imaging, photolithography and microscopy.

Presenter's Biography

GEORGE V. ELEFTHERIADES earned his Ph.D. and M.S.E.E. degrees in Electrical Engineering from the University of Michigan, Ann Arbor, in 1993 and 1989 respectively, and a diploma in Electrical Engineering from the National Technical University of Athens, Greece in 1988. In the period 1994-1997 he was with the Swiss Federal Institute of Technology in Lausanne. Presently he is a full Professor and the Canada Research/Velma M. Rogers Chair at the Department of Electrical and Computer Engineering at the University of Toronto. In June 2005 he co-edited/co-authored a book titled “Negative-Refraction Metamaterials: Fundamental Principles and Applications” published by Wiley & IEEE Press. Eleftheriades co-authored a paper on transmission-line metamaterials which has recently been named “the Fast Moving Front paper in Engineering” by Thomson’s Essential Science Indicators http://www.esi-topics.com/nhp/2004/march-04-GeorgeEleftheriades.html. Dr. Eleftheriades received the Ontario Premier's Research Excellence Award in 2001. In 2004 he received an E.W.R. Steacie Fellowship from the Natural Sciences and Engineering Research Council of Canada. Professor Eleftheriades is the recipient of the 2008 IEEE Kiyo Tomiyasu Technical Field Award “for pioneering contributions to the science and technological applications of negative-refraction electromagnetic materials”. Dr. Eleftheriades is a Fellow of the IEEE and serves as an IEEE Distinguished Lecturer. He is an associate editor of the IEEE Trans. on Antennas and Propagation and an elected AdCom member of the IEEE Antennas and Propagation Society. His present research interests include negative-refraction metamaterials for microwave and optical applications, antennas and components for wireless communications, novel antenna beam-steering techniques, plasmonic nano-structures, and electromagnetic design for high-speed digital circuits.

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