Electrical and Computer Engineering
Dean of Engineering
Faculty Host: Aydin Babakhani
DESY-Center for Free Electron Laser Science
ECE Seminar Series: Computational Electrodynamics: From Metamaterials and Metasurfaces to Compact X-ray Sources (698/699)
Wednesday, May 3, 2017
to 5:00 PM
1064 Duncan Hall
6100 Main St
Houston, Texas, USA
The emergence of computers in the last century and the surge of computation technology have revolutionized the research progress through advanced simulation tools. Research methodologies based on electromagnetic fields and waves, as the paramount method for investigating novel phenomena, were similarly affected by the simulation technology. The presentation aims to show few of the numerous research schemes where computational electrodynamics is playing a significant supportive role.
Metamaterials and metasurfaces have shown strong promise to scientists and engineers to realize materials with properties not found in nature. One of the outcomes of this research field was metamaterial absorbers, where thin wideband radar absorbers are pursued. Invent of 2D materials in the last years had shown strong potentials for developing tunable metasurfaces, whose simulation paves the way toward new functioning devices. Studying the sophisticated ultrafast dynamics of field-emitting electron sources is merely possible with advanced computational tools. Subsequently, the recently triggered project AXSIS (Frontiers in Attosecond X-ray Science: Imaging and Spectroscopy) will be introduced, where the role of computational electrodynamics for simulating, designing, and implementing a compact X-ray source is presented. In the AXSIS project at CFEL-Hamburg, funded by the European Research Council, we develop compact fully coherent, THz driven, attosecond X-ray source in conjunction with the new method of attosecond serial X-ray crystallography and spectroscopy, to give a full description of ultrafast processes atomically resolved in real space and on the electronic energy landscape. After a brief introduction of the AXSIS project, the accomplished tasks towards the complete simulation and design of the coherent X-ray source are presented.
Biography of Arya Fallahi:
Arya Fallahi, is currently a senior scientist at the DESY-Center for Free Electron Laser Science (CFEL). Born in Feb. 1982, and raised in Tehran, he finished his high school studies with the Gold medal in the national physics Olympiad in 1999. He received two bachelor degrees in applied physics and electrical engineering both from Sharif university of Technology (2004), and master of science degree in electrical engineering from Tehran university (2006). Afterwards, he moved to Switzerland, where he earned his PhD degree under the supervision of Prof. Christian Hafner from Swiss Federal Institute of Technology (ETH Zurich) in 2010 with the special award for most outstanding PhD thesis. He continued his career by joining the Paul Scherrer Institute (PSI) for a two year post-doctoral appointment in the group of Dr. Andreas Adelmann till 2012. Then, he moved to Germany for working as a computational physicist in the ultrafast optics and X-ray sources division of Prof. Franz Kärtner. His research interests focus on the general electromagnetics theory from low-frequency regime in RF accelerators and microwave metamaterials to ultrahigh frequency devices for optics, plasmonics, and X-ray science. He has been the inventor in three patents, authored and co-authored 36 journal publications and several conference papers.