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Simulation of in - Line Holograms

Published online by Cambridge University Press:  02 July 2020

Bernhard Frost
Affiliation:
EM Facility, University of Tennessee, Knoxville, TN 37996 and Oak Ridge National Laboratory, Oak Ridge, TN37831, USA
David Joy
Affiliation:
EM Facility, University of Tennessee, Knoxville, TN 37996 and Oak Ridge National Laboratory, Oak Ridge, TN37831, USA
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Extract

We simulated in-line holograms as obtained from a point projection microscope (PPM) [1]. The principal of the PPM is shown in Fig.1. A coherent electron wave emitted from a point source illuminates a sample transparent to the wave and travels to an electron detector. Since the wave from a point source is divergent the distance d of two points in the object plane results in a magnified distance D in the detector plane. The magnification of this arrangement is given by M=D/d=(z1+z2)/z1, where z1 and z2 are the tip to sample distance and the sample to detector distance, respectively. As no lenses are used we find a highly defocused shadow image in the detector plane. This arrangement is equivalent to Gabor's in-line holography with a physical source in plane of a lens-focused crossover, and the out-of-focus images are in-line electron holograms.

Type
Electron Holography
Copyright
Copyright © Microscopy Society of America

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References

1.Morton, G. A. and Ramberg, E. G., Phys. Rev, 56 (1939) 705CrossRefGoogle Scholar
3. This work is funded by SEMATECH, with Dr. H. Bogardus as project monitor, and SRC, with Dr. D. Herr as project monitor, under 99-LJ-413Google Scholar