Characterization of In-line Holographic Point Projection Microscope

  • Author / Creator
    Legg, Aaron P
  • To overcome the limitations of lens aberrations in an electron microscope, Dr. Dennis Gabor invented electron holography, a technique that uses no lenses. The technique uses low energies (60-200eV), which makes it ideal for imaging fragile biological samples. To suspend samples, graphene has been employed. Electron holography was initially limited by the source of coherent electrons. New field-emission sources have shown the required coherence for high resolution electron holography. Previously, tungsten(110) polycrystalline tips were used as a source. Using a graphene knife edge, I compare new tungsten(111) single crystalline hybrid tips as an alternative due to their stability during etching. During the knife edge experiment, I noticed small defects on the surface of the film. I was able to obtain a high resolution measurement of 6.8 \AA. New standard samples, such as gold on graphene, must be explored to increase our understanding of the resolution of an electron holography microscope.

  • Subjects / Keywords
  • Graduation date
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
  • Institution
    University of Alberta
  • Degree level
  • Department
  • Supervisor / co-supervisor and their department(s)
  • Examining committee members and their departments
    • Heimpel, Moritz (Department of Physics)
    • Hegmann, Frank (Department of Physics)
    • Beamish, John (Department of Physics)