Metasurfaces for perfect control of reflection and refraction
Antennas & Propagation / Microwave Theory & Techniques Chapter
Electrically thin composite layers (metasurfaces) can be used to realize extremely thin absorbers, lenses, focusing reflectors, and more. Conventionally, the design of metasurfaces as well as reflectarray and transmitarray antennas has been based on assuring the desired reflection or transmission properties at every point of the metasurface area, using so called generalized laws or refraction and reflection. We will show that this approach in fact does not lead to exactly the required performance. Furthermore, we will show how it is possible to create metasurfaces which function exactly as is required by the design specification. The results will be illustrated on the examples of perfect anomalous reflection and refraction of plane waves and on some “multi-channel” metasurface devices: perfect power splitters and three-channel mirrors.
Date and Time
- Date: 05 Apr 2017
- Time: 11:00 AM to 12:00 PM
- All times are (GMT-06:00) US/Central
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Professor Sergei A. Tretyakov (Fellow, IEEE), received the Dipl. Engineer-Physicist, the Candidate of Sciences (PhD), and the Doctor of Sciences degrees (all in radiophysics) from the St. Petersburg State Technical University (Russia), in 1980, 1987, and 1995, respectively. From 1980 to 2000 he was with the Radiophysics Department of the St. Petersburg State Technical University. From the year 2000 he has been working in Helsinki University of Technology (Finland), which became Aalto University in 2010, after a merge with two other universities in Helsinki. Presently, he is professor of radio engineering at the Department of Radio Science and Engineering, Aalto University, Finland. He was the founder and the first chairman of the St. Petersburg IEEE ED/MTT/AP Chapter (1995-1998), Member of the European Microwave Conferences Management Committee (2000-2002), President of the Virtual Institute for Artificial Electromagnetic Materials and Metamaterials (”Metamorphose VI”), an International Association of European universities (2007–2013), and the general chair of the International Congress Series on Advanced Electromagnetic Materials in Microwaves and Optics (Metamaterials) from 2007 to 2013. At present, he is a Deputy Member, URSI (International Union of Radio Science) Finnish National Committee, (from 2006) and a Steering Committee Member, European Doctoral Degree Programmes on Metamaterials EUPROMETA. The main scientific interests of prof. S. Tretyakov are electromagnetic field theory, complex media electromagnetics, antennas, and microwave engineering. He is the author or co-author of five research monographs, 16 book chapters, and more than 270 journal papers. More information can be found on the web sites users.aalto.fi/sergei and meta.aalto.fi.