Applied Electromagnetics in the Time Domain
Lecture by Prof. Richard W. Ziolkowski, The University of Arizona, Tucson, USA
Lecture Title: Applied Electromagnetics in the Time Domain
Cost: Free
Date: Monday, May 25, 2026
Time: 16:00 - 17:00 (EEST)
Location: Aristotle University of Thessaloniki, Faculty of Engineering, School of Electrical and Computer Engineering, Building D, Ground Floor, Assembly Room
Address: University Campus, 54124 Thessaloniki, Greece
Supported by: Electron Devices/Microwave Theory and Techniques/Antennas and Propagation Joint Chapter, IEEE Greece Section
Contact Information:
Zaharias D. Zaharis, MSc, PhD, SMIEEE, SMURSI
Chair of Electron Devices/Microwave Theory and Techniques/Antennas and Propagation Joint Chapter
IEEE Greece Section
email: zaharis@auth.gr
Abstract:
There has been substantial recent interest in time-modulated metastructures for applied electromagnetics. The combination of spatial and temporal variations enables a wide range of linear and nonlinear phenomena across RF, microwave, millimeter-wave, terahertz, and optical frequencies. However, analyses of these effects remain largely anchored to quasi-frequency-domain approaches. Which fundamental frequency-domain concepts do not directly carry over into the time domain?
Consider an electric or magnetic dipole radiator, or their combination as a Huygens dipole antenna. In the time domain, the transmitting and receiving patterns of a pulse-driven antenna differ fundamentally by a time derivative. Likewise, the energy and power patterns of a radiator differ fundamentally because power and energy are related through a time integral.
Wave absorption in a macroscopically homogeneous medium is generally described by the Beer-Lambert Law, with the decay rate derived, for example, from a frequency-domain Lorentz model. However, when the wave is an ultrashort pulse whose duration is shorter than the medium relaxation time, it can “sneak through” the medium with little or no absorption.
Metamaterials and metasurfaces exhibiting negative permittivity and/or permeability have been widely studied using frequency-domain dispersion models to predict exotic scattering and propagation phenomena. Yet, because the unit cells interact and couple to achieve these negative properties, time is required for them to emerge; they are not instantaneous. This temporal requirement can affect practical applications.
There is also growing interest in waveform design for advanced applications. Frequency-domain Bessel beams (BBs) maintain their shape in the near field and recover it after interacting with objects, i.e., they are self-healing. Their time-domain counterparts, localized waves (LWs), recently termed space-time wave-packets, were discovered earlier as exact space-time solutions of Maxwell’s equations. What are their properties and advantages over BBs, and why have they seen limited use in the microwave regime?
These and other examples illustrating the differences between time-domain and frequency-domain applied electromagnetics will be reviewed, together with advanced-concept systems where time-domain properties may provide advantages in practical applications.
Speaker Biography:
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Richard W. Ziolkowski received the B.Sc. (magna cum laude) degree (Hons.) in physics from Brown University, Providence, RI, USA, in 1974; the M.S. and Ph.D. degrees in physics from the University of Illinois at Urbana-Champaign, Urbana, IL, USA, in 1975 and 1980, respectively; and an Honorary Doctorate degree from the Technical University of Denmark (DTU), Kongens Lyngby, Denmark in 2012. He is currently a Professor Emeritus with the Department of Electrical and Computer Engineering at The University of Arizona, Tucson, AZ, USA. He was a Litton Industries John M. Leonis Distinguished Professor in the College of Engineering and was also a Professor in the College of Optical Sciences until his retirement in 2018. He was also a Distinguished Professor in the Global Big Data Technologies Centre in the Faculty of Engineering and Information Technologies (FEIT) at the University of Technology Sydney, Ultimo NSW Australia from 2016 until 2023. He was the Computational Electronics and Electromagnetics Thrust Area Leader with the Engineering Research Division of the Lawrence Livermore National Laboratory before joining The University of Arizona in 1990. Prof. Ziolkowski was the recipient of the 2019 IEEE Electromagnetics Award (IEEE Technical Field Award). He is an IEEE Life Fellow, as well as a Fellow of OPTICA (previously the Optical Society of America, OSA) and the American Physical Society (APS). He was the 2014-2015 Fulbright Distinguished Chair in Advanced Science and Technology (sponsored by DSTO, the Australian Defence Science and Technology Organisation). He served as the President of the IEEE Antennas and Propagation Society (AP-S) in 2005 and has had many other AP-S leadership roles. He is also actively involved with the URSI (International Union of Radio Science) Commission B and the European Association on Antennas and Propagation (EurAAP). He is the co-Editor of the best-selling 2006 IEEE-Wiley book, Metamaterials: Physics and Engineering Explorations, as well as the co-author and co-Editor, respectively, of the recent Wiley-IEEE books: Advanced Antenna Array Engineering for 6G and Beyond Wireless Communications (2022) and Antenna and Array Technologies for Future Wireless Ecosystems (2022). |
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- Aristotle University of Thessaloniki
- University Campus
- Thessaloniki, Macedonia
- Greece 54124
- Building: Building D
- Room Number: Assembly Room
- Click here for Map
- Contact Event Host
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Zaharias Zaharis, MSc, PhD, SMIEEE, SMURSI
Chair of Electron Devices/Microwave Theory and Techniques/Antennas and Propagation Joint Chapter, IEEE Greece Section
email: zaharis@auth.gr
Speakers
Prof. Richard W. Ziolkowski
Computational Electromagnetics
Biography:
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Richard W. Ziolkowski received the B.Sc. (magna cum laude) degree (Hons.) in physics from Brown University, Providence, RI, USA, in 1974; the M.S. and Ph.D. degrees in physics from the University of Illinois at Urbana-Champaign, Urbana, IL, USA, in 1975 and 1980, respectively; and an Honorary Doctorate degree from the Technical University of Denmark (DTU), Kongens Lyngby, Denmark in 2012. He is currently a Professor Emeritus with the Department of Electrical and Computer Engineering at The University of Arizona, Tucson, AZ, USA. He was a Litton Industries John M. Leonis Distinguished Professor in the College of Engineering and was also a Professor in the College of Optical Sciences until his retirement in 2018. He was also a Distinguished Professor in the Global Big Data Technologies Centre in the Faculty of Engineering and Information Technologies (FEIT) at the University of Technology Sydney, Ultimo NSW Australia from 2016 until 2023. He was the Computational Electronics and Electromagnetics Thrust Area Leader with the Engineering Research Division of the Lawrence Livermore National Laboratory before joining The University of Arizona in 1990. Prof. Ziolkowski was the recipient of the 2019 IEEE Electromagnetics Award (IEEE Technical Field Award). He is an IEEE Life Fellow, as well as a Fellow of OPTICA (previously the Optical Society of America, OSA) and the American Physical Society (APS). He was the 2014-2015 Fulbright Distinguished Chair in Advanced Science and Technology (sponsored by DSTO, the Australian Defence Science and Technology Organisation). He served as the President of the IEEE Antennas and Propagation Society (AP-S) in 2005 and has had many other AP-S leadership roles. He is also actively involved with the URSI (International Union of Radio Science) Commission B and the European Association on Antennas and Propagation (EurAAP). He is the co-Editor of the best-selling 2006 IEEE-Wiley book, Metamaterials: Physics and Engineering Explorations, as well as the co-author and co-Editor, respectively, of the recent Wiley-IEEE books: Advanced Antenna Array Engineering for 6G and Beyond Wireless Communications (2022) and Antenna and Array Technologies for Future Wireless Ecosystems (2022). |
Email:
Address:The University of Arizona, Department of Electrical and Computer Engineering, 1230 E. Speedway Blvd., Tucson, Arizona, United States, AZ 85721-0104