”When electromagnetic waves propagate through random dielectric media, they scatter in a predictable, deterministic way. The process is also fully reversible. If one sends an exiting wave backward through the same material, it will converge back to its original form and location in the same amount of time it took to originally propagate through the material. Due to this predictability, a great deal of research has went into studying these scattering processes in multimode fibers, diffusers, biological tissues, and other media. Scientists have turned random scattering material into focusing lenses, image transmitters, and highly transmitting media by controlling the impinging wavefronts with Spatial Light Modulators (SLMs).
The purpose of this work is to determine whether or not there is “one size fits all" impinging waveform which, assuming nothing is known about the material, is your best bet for maximum transmission. If such a waveform existed, researchers would no longer need to measure the materials’ transmission matrix, optimize waveforms, measure complex interference patterns, or invasively embed local sensors into the system. Using a combination of iterative feedback and transmission matrix approaches, we devised an algorithm which computed this average wavefront for several different systems, concluding that the best average transmission takes place when maximum flux is placed upon the path of least resistance, similar to electronic conduction”--Abstract, page iii.
M.S. in Physics
Missouri University of Science and Technology
vii, 48 pages
© 2018 Jayson Robert Summers, All rights reserved.
Thesis - Open Access
Electronic OCLC #
Summers, Jayson Robert, "Universal wavefront transmission through disordered media" (2018). Masters Theses. 8065.