Event
Ph.D. Research Proposal Exam: Benjamin W. Frazier
Friday, October 2, 2020
2:00 p.m.
Zoom (Conference ID 94772274591)
Maria Hoo
301 405 3681
mch@umd.edu
ANNOUNCEMENT: Ph.D. Research Proposal Exam
Name: Benjamin W. Frazier
Committee:
Professor Thomas M. Antonsen Jr. (Chair)
Professor Steven M. Anlage
Professor Edward Ott
Date/time: Friday, October 2, 2020 2pm-4pm
Location: Zoom (Conference ID 94772274591)
Title:
Wavefront Shaping in Complex Cavities
Abstract:
Extreme electromagnetic environments can inject noise and unwanted coupling into electronic components, so mitigation of potential interference is critical for modern electronic systems. Metasurfaces can be leveraged to provide this protection through exploitation of additional spatial degrees of freedom. Applications include generation of microwave coldspots at desired locations and realizing Coherent Perfect Absorption (CPA) states, where incoming waves are completely absorbed. Preliminary research developed a novel optimization algorithm and demonstrated the ability to induce CPA and microwave coldspots on demand at near-arbitrary frequencies in complex scattering systems. The ability to create coldspots was shown with multiple input directions and multiple simultaneous frequency bands. The observed scattering statistics were shown to be consistent with the Random Coupling Model (RCM), which adds a novel dimension to CPA as well as metasurface physics. The analytical framework of the RCM opens an innovative theoretical understanding of CPA and enables potential revolutionary applications in imaging, sensing, and communications. The proposed research will i) continue to leverage the RCM to establish a theoretical understanding of CPA; and ii) investigate the use of deep learning to generate optimal metasurface commands.
