Matthijs Dries

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Resolution in scanning transmission electron microscopy (STEM) is ultimately limited by the diameter of the electron beam. The electron beam diameter is not only determined by the properties of the condenser lens system but also by electron scattering in the specimen which leads to electron-beam broadening and degradation of the resolution with increasing(More)
Gamma-Ray Bursts (GRBs) are very energetic explosions. Probably they are the most energetic events in our universe following the Big Bang. A GRB is characterized by an intense flash of γ-radiation, in which ∼ 10 − 10 ergs is released in a few seconds, followed by an afterglow in all parts of the electromagnetic spectrum. Although not observed yet, theory(More)
Thin-film-based phase-plates are applied to enhance the contrast of weak-phase objects in transmission electron microscopy. In this work, metal-film-based phase-plates are considered to reduce contamination and electrostatic charging, which up to now limit the application of phase-plates fabricated from amorphous C-films. Their crystalline structure(More)
A method is described for the reconstruction of the amplitude and phase of the object exit wave function by phase-plate transmission electron microscopy. The proposed method can be considered as in-line holography and requires three images, taken with different phase shifts between undiffracted and diffracted electrons induced by a suitable phase-shifting(More)
Achieving phase contrast for weak-phase objects has been the driving force for the development of physical phase plates (PP) for transmission electron microscopy (TEM). Thin-film PPs have meanwhile reached a well-developed state [1]. However, carbon-based PPs suffer from fast material degradation under intense electron irradiation which has initiated the(More)
Transmission electron microscopy phase-contrast images taken by amorphous carbon film-based phase plates are affected by the scattering of electrons within the carbon film causing a modification of the image-wave function. Moreover, image artefacts are produced by non-centrosymmetric phase plate designs such as the Hilbert-phase plate. Various methods are(More)
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