Browsing Fakultät für Physik (inkl. GAUSS) by Referee "Krebs, Hans-Ulrich Prof. Dr."
Now showing items 1-20 of 32
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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, ... -
Mechanische Spektroskopie an PMMA-Systemen: Nichtlineares Verhalten und UV-aktive Blockcopolymere
(2017-03-16)This thesis focuses on two different topics. Firstly the occurence of nonlinear higher harmonic contributions in the mechanical response of polymethylmethacrylate (PMMA) is investigated with dynamic mechanical analysis. ... -
Minimizing thermal conductivity in laser deposited multilayers
(2017-01-26)Heat, light and electricity are three foundation pillars not only of physics, but also of our daily lives. Therefore, these have been studied by scientists for centuries and an always better understanding of the underlying ... -
Hydrogen absorption property of nanocrystalline-magnesium films
(2016-11-07)The purpose of this study is to investigate hydrogen absorption properties of grain boundary rich pure magnesium film. X-ray diffraction (XRD) measurements has been carried out to estimate microstructures, texture, lattice ... -
Critical thicknesses in Nb-H thin films: coherent and incoherent phase transitions, change of precipitation and growth modes and ultrahigh mechanical stress
(2016-08-03)For nanoscale systems such as Me-H thin films, changes of physical properties have been suggested to appear below certain critical sizes. The probable existence of these critical sizes and the related changes of thermodynamical ... -
Multilagenzonenplatten für die Mikroskopie mit harter Röntgenstrahlung
(2016-08-02)X-ray microscopy is due to the small wavelength and high penetration depth an auspicious technique for improved investigations of materials on nm-scale. For this, multilayer zone plates (MZP) with well-defined and smooth ... -
Magnetization and elastic dynamics in nanostructured metamaterials
(2016-03-24)In this work, magnetization and elastic dynamics in nano-structured artificial materials have been investigated in an all-optical, time-resolved, pump-probe experimental setup. Rich dynamics are brought about by means ... -
Thermodynamic and kinetic properties of metallic glasses during ultrafast heating
(2015-05-18)When a system is cooled from the high temperature liquid state below its liquidus temperature, the dynamics of the system start to deviate from the ones in the equilibrium high temperature liquid. There are a number of ... -
Spannungsinduzierte Wellenbildung in laserdeponierten Polymer/Metall-Systemen
(2014-07-24)Multilayer thin films with dimensions at the nanometer scale represent a technologically important class of materials where the interface and size effects play an important role. Interestingly, when polymer/metal multilayers ... -
Next-Generation Perturbed Angular Correlation Spectroscopy
(2014-06-12)Time differential perturbed angular correlation (TDPAC) spectroscopy is a nuclear solid-state physics method with unique advantages: Due to the penetrating power of gamma radiation used as information carrier, it allows ... -
Untersuchung der elektrischen Hyperfeinwechselwirkung in M<sub>n+1</sub>AX<sub>n</sub>-Phasen mittels der gestörten γ-γ-Winkelkorrelation
(2014-05-19)Mn+1AXn phases are thermodynamically stable nanolaminated ternary carbides and nitrides showing both metallic and ceramic properties. The letter M stands for an early transition metal, the letter A represents an A-element ... -
Beeinflussung des Wachstums von Metall auf Polymer durch die gepulste Laserdeposition
(2014-03-24)Nowadays, fabrication of embedded metal particles in dielectric matrices plays an important role for technical devices, e.g. data storage, sensors or enhancement of efficiency of solar cells. In this work, metal nanoparticles ... -
Electrical characterization of conductive ion tracks in tetrahedral amorphous carbon with copper impurities
(2014-01-10)The irradiation of tetrahedral amorphous carbon (ta-C) with swift heavy ions leads to the formation of conductive microscopic ion tracks with diameters of about 10 nm. This phenomena depends on the sp² to sp³ hybridization-ratio ... -
Position-controlled selective area growth of Ga-polar GaN nanocolumns by molecular beam epitaxy
(2013-12-19)This thesis focuses on the position-controlled selective area growth of Ga-polar GaN nanocolumns by molecular beam epitaxy. Part I of this thesis reviews the theoretical background which is considered to be vital for the ... -
Ein Verfahren zur Herstellung zweidimensionaler Röntgenwellenleiter
(2013-07-15)As X-ray beams only weakly interact with matter, conventional refracting optics are not suitable for the use in this energy range. Instead, different approaches replace conventional optics in the X-ray regime, one of them ... -
Multilagenbasierte Transmissionsoptiken für die Röntgenmikroskopie
(2012-08-23)Microscopy in the x-ray regime (0,001 – 10 nm wavelength) is a well-established method filling the gap between light and electron microscopy. Focusing of x-rays using transmission optics like zone plates, spatial resolutions ... -
Relaxationen in komplexen Fluiden
(2010-12-20)Relaxation processes of complex fluids show a significant aspect for understanding of metallic glasses as well as polymers. Therefore, the interpretation of the macroscopic features due to ... -
Untersuchungen zur Polymerdynamik an laserdeponierten Poly(alkyl methacrylat)-Filmen
(2010-04-06)Pulsed Laser Deposition is an extremely versatile method for preparation of thin films of a wide range of material classes. The associated ablation mechanisms are very complex - especially ... -
Charakterisierung und Modifizierung glatter laserdeponierter Poly(methyl methacrylat)-Schichten
(2010-04-06)Even though poly(methyl methacrylate) (PMMA) belongs to the weak absorbing materials at a wavelength of 248 nm, it is possible for the first time to deposit very smooth PMMA films with the ...