computational electromagnetics

Efficient and Accurate Numerical Techniques for Sparse Electromagnetic Imaging

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KAUST

In this thesis, efficient solutions are sought out to fundamental problems in Electromagnetic (EM) imaging that determines the shape, location, and material properties of an (unknown) object of interest in an investigation domain from the scattered field measured away from it. The solution of an EM inverse scattering problem inherently poses two main challenges: (i) non-linearity, since the scattered field is a non-linear function of the material properties and (ii) ill-posedness, since the integral operator has a smoothing effect and the number of measurements is finite in dimension and they are contaminated with noise. The non-linearity is tackled incorporating a multitude of techniques (ranging from Born approximation (linear), inexact Newton (linearized) to complete non-linear iterative Landweber schemes) that can account for weak to strong scattering problems. The ill-posedness of the EM inverse scattering problem is circumvented by formulating the above methods into a minimization problem with a sparsity constraint, which assumes that the dimension of the unknown object relative to the investigation domain is much smaller. Numerical experiments, which are carried out using synthetically generated measurements, show that the images recovered by these sparsity-regularized methods are sharper and more accurate than those produced by existing methods. The methods developed in this work have potential application areas ranging from oil/gas reservoir engineering to biological imaging where sparse domains naturally exist.

Prof. Hakan Bagci Elevated to Senior Member of IEEE

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Prof. Hakan Bagci has been elevated to the rank of Senior Member of IEEE. This is considered an important honor since only 8% of nearly 400,000 IEEE members are Senior Members because of their superior professional achievements.

Professor Bagci Elevated to Senior Membership Status of the International Union of Radio Science

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Hakan Bagci, KAUST Associate Professor of electrical engineering, was recently elevated to Senior Membership of the International Union of Radio Science (URSI) for his research achievements in the field of computational electromagnetics, and his long-standing involvement in the URSI, which includes serving on several conference technical program committees and editorial boards of journals.

Sebastian Celis Sierra

Education Ph.D. student, Electrical and Computer Engineering, Division of Computer, Electrical and Mathematical Science and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2020-present M.S., Electrical Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2018-2020 B.S., Electrical Engineering (Power Engineering), Universidad de los Andes, Bogota, Colombia, 2014-2018 B.S., Electronics Engineering, Universidad de los Andes, Bogota, Colombia, 2014-2018 Research Interests Computational electromagnetics

Ruitao Sun

Education Ph.D. student, Electrical and Computer Engineering, Division of Computer, Electrical and Mathematical Science and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2021-present M.S., Material Engineering, Shanghai Jiao Tong University, Shanghai, China, 2018-2021 B.S., Mechanical Manufacture and Automation, Central South University, Changsha, China, 2014-2018 Research Interests Computational electromagnetics Dissemination Google Scholar ORCID

Rui Chen

Postdoctoral Research Fellow, Computational Electromagnetics
Rui Chen is a Postdoctoral Research Fellow working with Professor Hakan Bagci at the Computational Electromagnetics (CEM) research group at King Abdullah University of Science and Technology (KAUST). Education Ph.D. degree, Electrical and Computer Engineering, Division of Computer, Electrical and Mathematical Science and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2015-2021. M.S., Electromagnetic Field and Microwave Technology, Nanjing University of Science and Technology, Nanjing, China, 2010-2015. B.S., Communication Engineering

Ran Zhao

Postdoctoral Research Fellow, Electrical and Computer Engineering
Education Ph.D. in Electromagnetic Field and Microwave Technology, University of Electronic Science and Technology of China, Chengdu, China, 2011-2016 B.S. in Electronic Engineering, Anhui University, Hefei, China, 2007-2011 Professional Appointments Postdoctoral Research Fellow in Electrical and Computer Engineering, Division of Computer, Electrical and Mathematical Science and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2019-present Assistant professor in the school of Electronic and Information Engineering, Anhui University, Hefei

Ming Dong

Education Ph.D. student, Electrical and Computer Engineering, Division of Computer, Electrical and Mathematical Science and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2019-present M.S., Electrical Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2017-2018 B.S., Electronic Information Science and Technology, Lanzhou University, Lanzhou, China Research Interests Computational physics (electromagnetics, semiconductor devices, multiphysics modeling) Application of TD-FEM solver and DGTD solver

Meruyert Khamitova

Education M.S. student, Electrical and Computer Engineering, Division of Computer, Electrical and Mathematical Science and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2020-present B.S., Electrical and Computer Engineering, Nazarbayev University, Nur-Sultan, Kazakhstan, 2015-2020 Research Interests Computational electromagnetics Dissemination Google Scholar ORCID

Mehmet Burak Ozakin

Postdoctoral Research Fellow, Electrical and Computer Engineering
Education Ph.D., Department of Electronic Engineering, Gebze Technical University, Kocaeli, Turkey, 2017 M.S., Department of Electronic Engineering, Gebze Technical University, Kocaeli, Turkey, 2011 B.S., Department of Electronic Engineering, Gebze Technical University, Kocaeli, Turkey, 2009 Professional Appointments Postdoctoral Research Fellow in Electrical and Computer Engineering, Division of Computer, Electrical and Mathematical Science and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2017-present Research Assistant in Department

Lingqi Gao

Education Ph.D. Student, Electrical and Computer Engineering, Division of Computer, Electrical and Mathematical Science and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2022-present M.S., Applied Geophysics, College of geoexploration Science and Technology, Jilin University, Changchun, China, 2019-2022 B.S., Applied Geophysics, College of geoexploration Science and Technology, Jilin university, Changchun, China, 2015-2019 Research Interests Computational electromagnetics Inverse problems in electromagnetics Dissemination Google Scholar

Junze Shao

Education Ph.D. Student, Electrical and Computer Engineering, Division of Computer, Electrical and Mathematical Science and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2023-present M.S., Electronic Science and Technology , University of Electronic Science and Technology of China ( UESTC ), Chengdu , Sichuan, China , 20 20 -20 23 B.S., Electronic Science and Technology, University of Electronic Science and Technology of China (UESTC), Chengdu, Sichuan, China, 2016-2020 Research Interests Computational electromagnetics Dissemination

Kaikun Niu

Postdoctoral Research Fellow, Electrical and Computer Engineering
Education Ph.D., Electromagnetic field and microwave technology, School of electronics and information engineering, Anhui University, Hefei, China, 2019 B.S., Engineering in electronics and information engineering, School of electronics and Information engineering, Anhui University, Hefei, China, 2014 Professional Appointments Postdoctoral Research Fellow in Electrical and Computer Engineering, Division of Computer, Electrical and Mathematical Science and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2019-2020 Visiting Student in

Hakan Bagci

Professor Bagci is a highly accomplished researcher in the field of computational electromagnetics (CEM). His research focuses on the theoretical and applied aspects of CEM.

Doolos Aibek Uulu

Education Ph.D. Student, Electrical and Computer Engineering, Division of Computer, Electrical and Mathematical Science and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2017-present M.S., Material Science and Nanotechnology, Bilkent University, Ankara, Turkey, 2015-2017 B.S., Department of Physics, Middle East Technical University (METU), Ankara, Turkey, 2010-2015 Professional Appointments Research Assistant in Material Science and Nanotechnology, Bilkent University, Ankara, Turkey, 2015-2017 Research Interests Computational

Ali Imran Sandhu

Education Ph.D. Student, Electrical and Computer Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 2010-present M.S., Communication Engineering, Chalmers University of Technology Sweden, Sweden, 2008-2010 B.S., Electronics Engineering, Comsats University Islamabad, Pakistan, 2003-2007 Professional Appointments Research Engineer, European Project FLEXWIN, University of Calabria, Italy, September 2011 Lecturer, Electrical Engineering Department, Comsats University Islamabad (CUI), Lahore, Pakistan, October 2007 Research Interests Computational