Browsing Fakultät für Physik (inkl. GAUSS) by Advisor & Referee "Ropers, Claus Prof. Dr."
Now showing items 21-34 of 34
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Ultrafast low-energy electron diffraction at surfaces
(2019-02-22)Due to their reduced dimensionality, surfaces and quasi two-dimensional materials exhibit numerous intriguing physical phenomena that drastically differ from the bulk. To resolve these effects and the associated dynamics ... -
Hochauflösende Bildgebung und NEXAFS-Spektroskopie mit weicher Röntgenstrahlung aus laserinduzierten Plasmen
(2019-01-24)Soft x-ray microscopy and absorption spectroscopy are extremely useful tools for high-resolution imaging and chemical analysis of samples in various scientific fields. However, due to the required high photon flux of ... -
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, ... -
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. ... -
THz streaking at metal nanotips
(2018-03-20)This thesis addresses various aspects of terahertz (THz) streaking at metallic nanotips. In THz near-field streaking, electron pulses emitted by femtosecond near-infrared (NIR) pulses are accelerated in a THz-induced ... -
Lichtinduzierte magnetische Defekte in ultradünnen Filmen
(2018-02-09)Topological defects such as domain walls, vortices or skyrmions in magnetic layers, exhibit promising properties which make them especially interesting for future applications in information technology. This work examines ... -
Localizing and tracking of fluorescent molecules with minimal photon fluxes
(2018-01-19)In this thesis MINFLUX is presented, a novel optical scheme to determine the position of individual photon emitters in space. By probing the emitter with adapted illumination profiles featuring an intensity zero, the number ... -
Coherent Control and Reconstruction of Free-Electron Quantum States in Ultrafast Electron Microscopy
(2018-01-04)The present (cumulative) thesis examines the quantum coherent interaction of ultrashort free-electron pulses with tailored optical near-fields. Multiple fields are utilised to prepare, coherently manipulate and characterise ... -
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 ... -
Development and characterization of an electron gun for ultrafast electron microscopy
(2015-12-21)Ultrafast electron microscopy is an emerging field of research offering the potential to investigate structural processes on a femtosecond time-scale with nanometer resolution. In order to further advance ultrafast electron ... -
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 ... -
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, ...