Holographic Sculpting of Electron Beams with Diffraction Gratings
| dc.contributor.advisor | Taylor, Richard | |
| dc.contributor.author | Pierce, Jordan | |
| dc.date.accessioned | 2019-01-11T22:26:56Z | |
| dc.date.available | 2019-01-11T22:26:56Z | |
| dc.date.issued | 2019-01-11 | |
| dc.description.abstract | Electron microscopes offer scientists an invaluable tool in probing matter at a very small scale. Rapid advancements over the past several decades has allowed electron microscopes to routinely image samples at the atomic scale. These advancements have been in all aspects of electron microscope design – such as more stable control voltages and currents, brighter and more coherent sources, beam aberration correction, and direct electron detectors, to name a few. One very recent advancement is in shaping the electron beam to provide an almost arbitrary set of possible beam profiles. Following the demonstration of electron vortex beams in 2010, there has been a surge of interest in the potential shaping electron beams. Utilizing holographic electron diffraction gratings, an almost arbitrary set of electron beams can be generated. These diffraction gratings are challenging to create due their tiny size and the precision with which they must be fabricated. We present a comprehensive study on the fabrication and design of electron diffraction gratings with the aim of being able to produce optimal gratings that result in bright, well separated beams which closely match a desired beam profile. We have developed and optimized fabrication of these gratings with focused ion beam milling, and have been able to use the fabricated gratings in a number of important experiments. These electron diffraction gratings have allowed us to perform various experiments such as aberration correction, electron helical dichroism, advanced phase-contrast imaging, and multi-beam interferometric techniques. Holographic beam shaping will continue to be an important tool for electron microscopists. | en_US |
| dc.identifier.uri | https://hdl.handle.net/1794/24182 | |
| dc.language.iso | en_US | |
| dc.publisher | University of Oregon | |
| dc.rights | All Rights Reserved. | |
| dc.subject | Diffraction | en_US |
| dc.subject | Electron | en_US |
| dc.subject | Grating | en_US |
| dc.subject | Holograms | en_US |
| dc.title | Holographic Sculpting of Electron Beams with Diffraction Gratings | |
| dc.type | Electronic Thesis or Dissertation | |
| thesis.degree.discipline | Department of Physics | |
| thesis.degree.grantor | University of Oregon | |
| thesis.degree.level | doctoral | |
| thesis.degree.name | Ph.D. |
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