Title:Recent Accomplishments of Metasurfaces towards High Frequency ApplicationsAbstract:Metasurface structures, being ultra-thin in nature has been emerged as applications for various frequency selective surfaces viz., absorber, polarizer, filter, phase-shifter etc. In metasurface based absorbing structures, several sorts of array of metallic patches are designed over a metal-backed dielectric material. The incorporation of metal at the bottom side prohibits the transmission of electromagnetic wave incident to the structure. A number of structures have been proposed over wide band of frequencies ranging from microwave to optical and so forth. Polarization converting structures have also been proposed using metasurface-based designs. In all these designs, asymmetry has been introduced in the unit cell so that the structure is chiral in nature. Both transmittive as well as reflective-type polarization conversion structures using metasurface designs have been reported till date. Very recently, graphene layer has been introduced in the metasurface-based designs to achieve tenability as well as enhancement of bandwidth. By control of applied chemical potential and electrical grating, the plasmonic response of the graphene can be modulated in order to achieve tunability over a wide frequency of incidence. Graphene layer has been incorporated in the unit cell of metasurface to generate wideband tunable <a href="http://applications.Bio:Somak" target="_blank" title="applications.Bio:Somak">applications.Bio:Somak Bhattacharyya has received his PhD degree in 2015 from(https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.iitk.ac.in%2F&data=05%7C02%7Chanieh.kianiamiri%40mail.utoronto.ca%7C24979b393d2b4c56268108ddb5c073a0%7C78aac2262f034b4d9037b46d56c55210%7C0%7C0%7C638866560385358160%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=lwN%2F7vkV2fQRFW4LbqknjnQnSdm4eldOfK7UGKgGQEg%3D&reserved=0), India. He had joined (https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fece.iiita.ac.in%2F&data=05%7C02%7Chanieh.kianiamiri%40mail.utoronto.ca%7C24979b393d2b4c56268108ddb5c073a0%7C78aac2262f034b4d9037b46d56c55210%7C0%7C0%7C638866560385371109%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=VzWuC2vFY15uDqo7qZyLxCUSYWM1ADin6NkVe2gcpF4%3D&reserved=0) at (https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fiiita.ac.in%2F&data=05%7C02%7Chanieh.kianiamiri%40mail.utoronto.ca%7C24979b393d2b4c56268108ddb5c073a0%7C78aac2262f034b4d9037b46d56c55210%7C0%7C0%7C638866560385383593%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=sHL4HOg%2FsjtU34jAUE5wdb8f4Dgoljs0ZAmCmK%2BEdF0%3D&reserved=0) in December 2015. He has published more than 60 International Journals and 150 reputed peer-reviewed International and national conference proceedings. He has received the prestigious Young Scientist Award from (https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ursi.org%2Fhomepage.php&data=05%7C02%7Chanieh.kianiamiri%40mail.utoronto.ca%7C24979b393d2b4c56268108ddb5c073a0%7C78aac2262f034b4d9037b46d56c55210%7C0%7C0%7C638866560385419824%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=6qsbzPRfNls6eEmepfASOROaVBtRzgQN6mpHWFnI0wY%3D&reserved=0) three times: Electromagnetic Theory Symposium 2013 in Hiroshima, Regional Radio Science Conference 2015 in New Delhi and Asia Pacific Radio Science Conference 2016 in Seoul. Owing to his contributions in the area of radio sciences, URSI has conferred him honorary lifetime membership. Dr. Bhattacharyya is an (https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ieee.org%2F&data=05%7C02%7Chanieh.kianiamiri%40mail.utoronto.ca%7C24979b393d2b4c56268108ddb5c073a0%7C78aac2262f034b4d9037b46d56c55210%7C0%7C0%7C638866560385432480%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=dxxtKw0YCpI4t2tI7jvCvg6quj8iFPbPMeAGUWsr3Cc%3D&reserved=0) senior member and elected as the Associate Fellow of (https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.wast.in%2F&data=05%7C02%7Chanieh.kianiamiri%40mail.utoronto.ca%7C24979b393d2b4c56268108ddb5c073a0%7C78aac2262f034b4d9037b46d56c55210%7C0%7C0%7C638866560385445230%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=YIQ%2BZeJXFEj2W1nce2pZnu1n4IFEucxhasmGSEMM2AI%3D&reserved=0). His current areas of interest lie in metasurface, periodic structures, opto-microwave devices, microwave photonics <a href="http://etc.Date:" target="_blank" title="etc.Date:">etc.Date: Tuesday, July 8, 2025Time: 3:00 PM ETLocation: BA 4287, University of Toronto (40 St. George Street)Room: BA4287, Bldg:Bahen Centre for Information Technology, 40 St. George Street Toronto, ON, M5S 2E4, Toronto, Ontario, Canada, M5S 2E4

Lecture 1: From ENGINEERING ELECTROMAGNETICS to ELECTROMAGNETIC ENGINEERING: Teaching/Training Next GenerationsAbstractThe role of Electromagnetic (EM) fields in our lives has been increasing. Communication, remote sensing, integrated command/ control/surveillance systems, intelligent transportation systems, medicine, environment, education, marketing, defense are only a few areas where EM fields have critical importance. We have witnessed the transformation from Engineering Electromagnetics to Electromagnetic Engineering for the last few decades after being surrounded by EM waves everywhere. Among many others, EM engineering deals with broad range of problems from antenna design to EM scattering, indoor–outdoor radiowave propagation to wireless communication, radar systems to integrated surveillance, subsurface imaging to novel materials, EM compatibility to nano-systems, electroacoustic devices to electro-optical systems, etc. The range of the devices we use in our daily life has extended from DC up to Terahertz frequencies. We have had both large-scale (kilometers-wide) and small-scale (nanometers) EM systems. Large portion of these systems are broadband and digital, and have to operate in close proximity that results in severe EM interference problems. Engineers have to take EM issues into account from the earliest possible design stages. This necessitates establishing an intelligent balance between strong mathematical background (theory), engineering experience (practice), and modeling and numerical computations (simulation).This keynote lecture aims at a broad-brush look at certain teaching / training challenges that confront wave-oriented EM engineering in the 21st century, in a complex computer and technology-driven world with rapidly shifting societal and technical <a href="http://priorities.The" target="_blank" title="priorities.The">priorities.The lecture also discusses modeling and simulation strategies pertaining to complex EM problems and supplies several user-friendly virtual tools, most of which have been presented in the IEEE AP Magazine and which are very effective in teaching and training in lectures such as EM Wave Theory, Antennas and Radiowave Propagation, EM Scattering and Diffraction, Guided Wave Theory, Microstrip Circuit Design, Radar Cross Section Prediction, Transmission Lines, Metamaterials, <a href="http://etc.References-" target="_blank" title="etc.References-">etc.References- Sevgi, Electromagnetic Modeling and Simulation, IEEE Press – John Wiley (EM Wave Series), NJ, Apr 2014.- Sevgi, Complex Electromagnetic Problems and Numerical Simulation Approaches, IEEE Press – John Wiley & Sons, May 2003.- Sevgi, A Practical Guide to EMC Engineering, ARTECH House, Norwood, MA, March 2017.- Apaydın, L. Sevgi, Radiowave Propagation and Parabolic Equation Modeling, IEEE Press – John Wiley, NJ, Sep 2017.- Apaydın, L. Sevgi, Electromagnetic Diffraction modeling and simulation with MATLAB, ARTECH House, Norwood, MA, Feb 2021.Speaker(s): Levent Sevgi , Room: 428, Bldg: Walter and Light Hall, Queen's University, Kingston, Ontario, Canada