Matthias Roeper
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View article: <i>In situ</i> SHG microscopy investigation of the domain-wall conductivity-enhancement procedure in lithium niobate
<i>In situ</i> SHG microscopy investigation of the domain-wall conductivity-enhancement procedure in lithium niobate Open
Conductive domain walls (CDWs) in the uniaxial ferroelectric lithium niobate (LiNbO3, LN) have attracted much interest as potential elements in 2D nanoelectronics due to their orders-of-magnitude larger electronic AC and DC conductivities …
View article: Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films
Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films Open
Stress plays a crucial role in thin films and layered systems, and thus significantly influences the material's electrical, mechanical and (nonlinear) optical responses. Despite lithium niobate's wide applicability as a nonlinear optical m…
View article: Depth resolution in piezoresponse force microscopy
Depth resolution in piezoresponse force microscopy Open
Piezoresponse force microscopy (PFM) is one of the most widespread methods for investigating and visualizing ferroelectric domain structures down to the nanometer length scale. PFM makes use of the direct coupling of the piezoelectric resp…
View article: Depth resolution in piezoresponse force microscopy
Depth resolution in piezoresponse force microscopy Open
Piezoresponse Force Microscopy (PFM) is one of the most widespread methods for investigating and visualizing ferroelectric domain structures down to the nanometer length scale. PFM makes use of the direct coupling of the piezoelectric resp…
View article: Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals
Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals Open
In the last two decades, variably doped strontium barium niobate (SBN) has attracted a lot of scientific interest mainly due to its specific non-linear optical response. Comparably, the parental compound, i.e., undoped SBN, appears to be l…
View article: Novel experimental setup for megahertz X-ray diffraction in a diamond anvil cell at the High Energy Density (HED) instrument of the European X-ray Free-Electron Laser (EuXFEL)
Novel experimental setup for megahertz X-ray diffraction in a diamond anvil cell at the High Energy Density (HED) instrument of the European X-ray Free-Electron Laser (EuXFEL) Open
The high-precision X-ray diffraction setup for work with diamond anvil cells (DACs) in interaction chamber 2 (IC2) of the High Energy Density instrument of the European X-ray Free-Electron Laser is described. This includes beamline optics,…
View article: Poling thin-film x-cut lithium niobate for quasi-phase matching with sub-micrometer periodicity
Poling thin-film x-cut lithium niobate for quasi-phase matching with sub-micrometer periodicity Open
Quasi-phase-matched grating structures in lithium niobate waveguides with sub-micrometer periodicities will benefit the development of short-wavelength nonlinear optical devices. Here, we report on the reproducible formation of periodicall…
View article: Semiautomatic High-Content Analysis of Complex Images from Cocultures of Vascular Smooth Muscle Cells and Macrophages: A CellProfiler Showcase
Semiautomatic High-Content Analysis of Complex Images from Cocultures of Vascular Smooth Muscle Cells and Macrophages: A CellProfiler Showcase Open
Automatization in microscopy, cell culture, and the ease of digital imagery allow obtainment of more information from single samples and upscaling of image-based analysis to high-content approaches. Simple segmentation algorithms of biolog…