Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8038244 | Ultramicroscopy | 2014 | 11 Pages |
Abstract
The optimum biprism position as suggested by Lichte (Ultramicroscopy 64 (1996) 79 [10]) was implemented into a state-of-the-art transmission electron microscope. For a setup optimized for atomic resolution holograms with a width of 30Â nm and a fringe spacing of 30Â pm, we investigated the practical improvements on hologram quality. The setup is additionally supplemented by a second biprism as suggested by Harada et al. (Applied Physics Letters 84 (2004) 3229 [12]). In order to estimate the possibilities and limitations of the double biprism setup, geometric optics arguments lead to calculation of the exploitable shadow width, necessary for strong reduction of biprism-induced artefacts. Additionally, we used the double biprism setup to estimate the biprism vibration, yielding the most stable imaging conditions with lowest overall fringe contrast damping. Electron holograms of GaN demonstrate the good match between experiment and simulation, also as a consequence of the improved stability.
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Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Florian Genz, Tore Niermann, Bart Buijsse, Bert Freitag, Michael Lehmann,