Browsing Fakultät für Physik (inkl. GAUSS) by Advisor "Ropers, Claus Prof. Dr."
Now showing items 1-17 of 17
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Radio-frequency controlled low-energy electron pulses
(2024-08-23)Electron beams are invaluable for probing material structures and dynamic processes due to their large scattering cross sections and the versatility of tunable electron optics for diffraction and microscopy. Pulsed electron ... -
Symmetries and correlations in solids probed by ultrafast high-harmonic spectroscopy
(2023-11-13)Novel material systems with correlated and tunable properties promise to push the boundaries of current information processing and energy management technologies. Their investigation requires simultaneous access to multiple ... -
Imaging vortex pinning and gyration by time-resolved and in-situ Lorentz microscopy
(2023-03-08)Magnetism encompasses a large variety of scientifically interesting and industrially valuable phenomena. In particular, nanoscopic magnetic textures—such as vortices, merons and skyrmions—have been in the spotlight of ... -
Ultrafast Probing and Coherent Vibrational Control of a Surface Structural Phase Transition
(2021-08-26)The present thesis explores the coherent control of surface structural phase transitions by all-optical manipulation of key vibrational modes. To this end, ultrafast low-energy electron diffraction (ULEED) in combination ... -
Ultrafast transmission electron microscopy of a structural phase transition
(2021-08-09)High hopes are placed on materials with tunable properties and excitations for future applications in energy conversion devices. Functionality of devices, however, not only arises from the properties of individual materials ... -
Probing Light-Matter Interactions in Plasmonic Nanotips
(2020-09-03)The exploration of light-matter interaction has inspired some of the most essential theories and applications in fundamental science and technology. Cutting-edge research, such as ultrafast time-resolved and super-resolution ... -
Non-equilibrium structural Dynamics of incommensurate Charge-Density Waves
(2020-07-01)In recent years, charge-density wave (CDW) systems have been studied extensively, as they provide a diverse testing field for basic concepts in electron-phonon coupling, electron correlation, and structural phase transitions. ... -
Ultrafast Lorentz Microscopy using High-Coherence Electron Pulses
(2019-05-08)Information processing and storage applications demand increasing miniaturization and operation speeds, where optical manipulation of magnetic order may play a very important role. It is hence essential to study how light ... -
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 ... -
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, ... -
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 ... -
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 ... -
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, ...