I am currently working on the development and optimization of Electro-Optical Modulators on the basis of Lithium-Niobate waveguides. Here, I am optimizing the layer architecture of the used electrode structures in terms of minimization of additional propagation losses, being induced by the passive interaction between the electrodes and the propagating optical fields. Additionally, these changes in the out-of-plane architecture, may influence the optical response of applied electrical fields, the mechanical stability and DC-Drift effects, limiting the performance of built devices on different time scales.
Making use of the characteristics of different crystal orientations with respect to the waveguide and electrode structures, different concepts of electro-optical modulators can be developed.
The modulators are fabricated in our cleanroom facility, by using lift-off schemes for micro-structuring and sputter-deposition for the fabrication of electrode structures consisting of different dielectric materials such as silica and different metal layers, acting as electrode.
I studied Physics in my bachelor's program and Physics - Nanoelectronics at RWTH Aachen University between 2010 and 2016. Both, my bachelor and my master thesis, I conducted within the working group of Prof. Matthias Wuttig.
Within my bachelor- and master thesis, I concentrated on the fabrication and characterization of thin-film phase change materials. Here, I fabricated thin layers of different PCMs by means of DC-magnetron sputter deposition, in order to achieve certain crystallographic structures.
Further, I characterized the samples by means of spectroscopic methods, X-ray diffractometry and electronic transport measurements at both, elevated and cryogenic temperatures.
Here, I for example synthesized the known phase change material Sb2Te3 in its metastable cubic structure and investigated its phase transformation to a stable rhombohedral structure upon annealing. Within this process, I found a metal-insulator transition from a Anderson-localization state to a metal-like electron transport regime within the metastable cubic structure.