Browsing Fakultät für Physik (inkl. GAUSS) by Referee "Salditt, Tim Prof. Dr."
Now showing items 21-40 of 71
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Next-Generation Ultrafast Transmission Electron Microscopy – Development and Applications
(2018-08-22)The present cumulative thesis covers the development and applications of a novel type of ultrafast transmission electron microscope (UTEM) employing high-coherence electron pulses from a nanoscale photocathode. Specifically, ... -
3d virtual histology of neuronal tissue by propagation-based x-ray phase-contrast tomography
(2018-07-05)Deciphering the three-dimensional (3d) cytoarchitecture of neuronal tissue is an important step towards understanding the connection between tissue function and structure and determining relevant changes in neurodegenerative ... -
Time-resolved X-ray phase-contrast tomography
(2018-06-27)X-ray tomography allows to obtain the three-dimensional (3d) structure of weakly interacting objects, such as tissue samples in biomedical imaging or nanoscale structures in materials science, with high spatial resolution. ... -
Intelligent-Illumination STED
(2018-04-10)Recently established fluorescence superresolution microscopy techniques, such as stimulated emission depletion (STED), are capable of imaging fixed and living cells at the nanometer scale. In STED, ON- and OFF-switching ... -
X-Ray Near-Field Holography: Beyond Idealized Assumptions of the Probe
(2017-11-08)All images are flawed, no matter how good your lenses, mirrors etc. are. Especially in the hard X-ray regime it is challenging to manufacture high quality optics due to the weak interaction of multi-keV photons with matter. ... -
Nanoscale Waveguiding Studied by Lensless Coherent Diffractive Imaging using EUV High-Harmonic Generation Source
(2017-07-24)The challenge of nanometric imaging drives intense efforts in applied sciences and fundamental research. Following the physical law of diffraction, the utilization of extreme ultraviolet (EUV) or X-ray radiation for imaging ... -
X-ray waveguide optics: Beyond straight channels
(2017-04-28)Modern x-ray sources and analysis techniques such as lens less imaging combined with phase retrieval algorithms allow for resolving structure sizes in the nanometerrange. For this purpose optics have to be employed, ... -
Tomographic STED Microscopy
(2017-03-09)Due to its non-invasive access to sub-cellular structures, far-field fluorescence microscopy constitutes one of the most prevalent methods in the life sciences. For more than one century, it had been common knowledge ... -
Measurement of the stopping power of water for carbon ions in the energy range of 1 MeV - 6 MeV using the inverted Doppler–shift attenuation method
(2016-12-08)Cancer therapy using carbon ions has gained increasing interest in the last decade due to its advantageous dose distributions. For the dosimetry and treatment planning, the accurate knowledge of the stopping power of water ... -
Computer simulation and analysis of self-assembled alkylthiol monolayers on the surface of liquid mercury
(2016-08-10)In this dissertation I investigate the structure and thermodynamics of alkylthiol (thiol) surfactants on the surface of liquid mercury (Hg) by means of the large-scale Molecular Dynamics (MD) techniques. Simulations ... -
Phase retrieval for object and probe in the optical near-field
(2016-01-12)Lensless, holographic X-ray microscopy is a non-invasive imaging technique that provides resolution on the nanometer scale. Therefore, a divergent, coherent and especially clean wavefront impinging on the sample is needed. ... -
Cone-beam x-ray phase-contrast tomography for the observation of single cells in whole organs
(2015-11-10)X-ray imaging enables the nondestructive investigation of interior structures in otherwise opaque samples. In particular the use of computed tomography (CT) allows for arbitrary virtual slices through the object and 3D ... -
Scanning X-Ray Nanodiffraction on Dictyostelium discoideum
(2015-11-06)In the recent years, novel focussing optics for synchrotron radiation sources became available, which now allow focussing the x-radiation down to 100\,nm (FWHM). Thus, the typically poor spatial resolution of Small Angle ... -
Developments in Femtosecond Nanoelectronics
(2015-01-21)Coupling light to metal surfaces can break the diffraction limit and concentrate optical fields at the nanoscale. The studies presented in this cumulative thesis investigate the influence of optical field localization ... -
Coherent X-Ray Diffractive Imaging on the Single-Cell-Level of Microbial Samples:
(2014-12-17)Since its first experimental demonstration in 1999, Coherent X-Ray Diffractive Imaging has become one of the most promising high resolution X-Ray imaging techniques using coherent radiation produced by brilliant synchrotron ... -
Development of an ultrafast low-energy electron diffraction setup
(2014-12-11)Quasi two-dimensional systems such as surfaces and atomically thin films can exhibit drastically different properties relative to the material's bulk, including complex phases and transitions only observable in reduced ... -
Sulfur Speciation in Urban Soils Studied by X-Ray Spectroscopy and Microscopy
(2014-04-03)The presented thesis is of pronounced interdisciplinary character; based on applied physics, it addresses a challenging analytical task in soil science. The goal of this work is to specify and analyze the sulfur pool ... -
Extreme-ultraviolet light generation in plasmonic nanostructures
(2014-01-30)The present (cumulative) thesis examines fundamentals of nanostructure-enhanced extreme-ultraviolet light generation in noble gases using two different nanostructure geometries for local field-enhancement. Specifically, ... -
Scanning X-Ray Nano-Diffraction on Eukaryotic Cells: From Freeze-Dried to Living Cells
(2013-12-13)The cytoskeleton of eukaryotic cells is a complex and dynamic network of different biopolymers, which plays an important role in, e.g., the determination of cellular shape, mechanical properties, and consequently specific ... -
Differentielle interferometrische Partikelverfolgung mit Subnanometer- und Submillisekundenauflösung
(2013-09-06)Single-particle tracking experiments have provided the opportunity to monitor dynamical processes on length scales from millimeter to subnanometer. Especially in biology, where relevant processes on the molecular level ...