Master of Science Thesis Defense By: Christopher A. Goonan
When: Tuesday,
December 19, 2017
10:00 AM
-
12:00 PM
Where: Science & Engineering Building, Lester W. Cory Conference Room: Room 213A
Cost: Free
Description: Topic: Computing the Scattering from Periodic, Rough Surfaces without Including Evanescent Modes
Location: Lester W. Cory Conference Room, Science & Engineering Building (SENG), Room 213A
Abstract:
For many decades, the issue of scattering of electromagnetic waves from periodic surfaces has been of great interest. When dealing with scattering on any surface, boundary conditions need to be met, and in order to satisfy these, non-propagating modes called evanescent waves have to be accounted for. In the case of scattering from a periodic surface, the scattered modes can be represented by a finite set of discrete, propagating modes and an infinite set of evanescent discrete modes. These evanescent modes decay rapidly and do not contribute in the far field, yet there are an infinite set of them that need to be accounted for. In this research, a new technique is developed which estimates a modal sub-space which is orthogonal to all the evanescent modes at the boundary. By projecting the boundary conditions on to this sub-space, the propagating scattered fields can be found in terms of the incident fields without calculating the evanescent modes. This technique accomplishes this by estimating the sub-space in terms of only the propagation constants and surface slopes. The proposed method reduces the complexity of the scattering problem significantly by eliminating the need to calculate the evanescent modes.
NOTE: All ECE Graduate Students are ENCOURAGED to attend.
All interested parties are invited to attend. Open to the public.
Advisor: Dr. Dayalan P. Kasilingam
Committee Members: Dr. Yifei Li, Department of Electrical & Computer Engineering and Dr. Gaurav Khanna, Physics Department
*For further information, please contact Dr. Dayalan P. Kasilingam at 508.999.8534, or via email at dkasilingam@umassd.edu.
Location: Lester W. Cory Conference Room, Science & Engineering Building (SENG), Room 213A
Abstract:
For many decades, the issue of scattering of electromagnetic waves from periodic surfaces has been of great interest. When dealing with scattering on any surface, boundary conditions need to be met, and in order to satisfy these, non-propagating modes called evanescent waves have to be accounted for. In the case of scattering from a periodic surface, the scattered modes can be represented by a finite set of discrete, propagating modes and an infinite set of evanescent discrete modes. These evanescent modes decay rapidly and do not contribute in the far field, yet there are an infinite set of them that need to be accounted for. In this research, a new technique is developed which estimates a modal sub-space which is orthogonal to all the evanescent modes at the boundary. By projecting the boundary conditions on to this sub-space, the propagating scattered fields can be found in terms of the incident fields without calculating the evanescent modes. This technique accomplishes this by estimating the sub-space in terms of only the propagation constants and surface slopes. The proposed method reduces the complexity of the scattering problem significantly by eliminating the need to calculate the evanescent modes.
NOTE: All ECE Graduate Students are ENCOURAGED to attend.
All interested parties are invited to attend. Open to the public.
Advisor: Dr. Dayalan P. Kasilingam
Committee Members: Dr. Yifei Li, Department of Electrical & Computer Engineering and Dr. Gaurav Khanna, Physics Department
*For further information, please contact Dr. Dayalan P. Kasilingam at 508.999.8534, or via email at dkasilingam@umassd.edu.
Contact:
ECE: Electrical & Computer Engineering Department 508.999.9164 http://www.umassd.edu/engineering/ece/
Topical Areas: General Public, University Community, College of Engineering, Electrical and Computer Engineering