The IEEE Kingston AP/MTT Joint Chapter in collaboration with IEEE Kingston Section is proud to sponsor the following seminar:
CYLINDRICAL ENNZ METAMATERIALS: PHENOMENA AND APPLICATIONS FROM MINIATURIZATION TO IMAGING
Date: Wednesday February 10th, 2016.
Venue: Walter Light Hall, Room 302, Queen’s University. Kingston, Ontario
Speaker: Dr. Ashwin K. Iyer, University of Alberta
Abstract: The spectacular growth of metamaterials (MTMs) research has been fueled by fantastic ideas like invisibility using MTM “cloaks” and imaging with unlimited resolution using MTM “superlenses”. These ideas, however, are just manifestations of a much more tangible concept: that MTMs afford unprecedented control over electromagnetic (EM) waves. This talk will focus on new ideas being developed at the University of Alberta involving cylindrical MTM geometries. Many microwave devices exhibit cylindrical symmetry (e.g. circular waveguides/apertures, dielectric-resonator antennas, radomes, etc.) and can benefit from the incorporation of MTMs. For example, we recently discovered that hollow circular waveguides lined with thin, cylindrical MTMs could potentially be operated well below their natural cutoff frequencies. This is tantamount to extreme miniaturization, which is unprecedented in the case of hollow-waveguide technology. I will present theory, simulations, and experiments verifying below-cutoff propagation and discuss three distinct and intriguing applications: (1) miniaturized waveguide probe antennas, capable of higher-spatial-resolution near-field characterization of antennas and surfaces, (2) enabling a new type of MRI based on traveling waves, and (3) the miniaturization of aperture arrays leading to new mechanisms for extraordinary transmission.
Speaker Bio: Dr. Ashwin K. Iyer received the BASc., MASc., and PhD degrees in elettrical engineering from the University of Toronto, Canada, in 2001, 2003, and 2009 respectively. He joined the faculty of the University of Alberta Dept. of Electrical and Computer Engineering in the fall of 2009, where he now leads a growing group of talented graduate students in the analysis, characterization and experimental validation of metamaterial phenomena and their applications to imaging and antennas.
Dr. Iyer was part of the pioneering effort at the University of Toronto in the early 2000s in developing metamaterials that exhibit a negative refractive index (NRI). Dr. Iyer’s contributions have greatly influenced the evolution of metamaterials and have mobilized much of the work in this area. He has contributed to several of the leading publications in the fields of RF/Microwave engineering, antennas, physics, and optics, with a total citation count of over 2500, and he has co-authored 4 invited chapters appearing in the earliest conferences on the subject of metamaterials.
Dr. Iyer has received numerous awards, including the 2008 R. W. P. King Award for the best paper published in the previous year by an author under the age of 36 years, and the 2015 Donald G. Dudley Jr. Undergraduate Teaching Award, both presented by the IEEE AP-S. His students are also recipients of several major national and international awards for their research. He currently serves as an associate editor of the IEEE Transactions on Antennas and Propagation and co-chair of the IEEE Northern Canada Section’s joint chapter of the AP-S and MTT-S societies. Dr. Iyer is a member of the IEEE and a registered member of the Association of Professional Engineers and Geoscientists of Alberta (APEGA).
This seminar is open to the general public with free admission and refreshments served afterwards.