Holography with Low Energy Electrons
Abstract
Coherent low energy electrons of 60-200 eV kinetic energy and sub-nanometer wavelength provide a tool to record holograms of individual bio-molecules, such as DNA or viruses. From the recorded holograms, the three-dimensional shape of the molecules can numerically be reconstructed. The experimental setup as well as the numerical reconstruction of low energy electron holograms from individual bio-molecules shall be discussed. Since most biological objects are transparent for electrons they introduce only a phase shift to the incident electron wave. We present a method to not only retrieve the absorbing (as most known methods do) but also the phase properties of the object wave. Finally, we present a general solution of the long-standing twin image problem in holography. It is applicable to any type of holography independent of the wavelength used and the nature of the wave, be it light, electrons, x-rays or any other coherent radiation.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2007
- Bibcode:
- 2007APS..MARB38009L