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Engineering AlGaAs-on-insulator toward quantum optical applications
/forschung/publikationen/engineering-algaas-on-insulator-toward-quantum-optical-applications
Aluminum gallium arsenide has highly desirable properties for integrated parametric optical interactions: large material nonlinearities, maturely established nanoscopic structuring through epitaxial…
Vertical conductivity and Poole-Frenkel-ionization of Mg acceptors in AlGaN short-period superlattices with high Al mole fraction
/forschung/publikationen/vertical-conductivity-and-poole-frenkel-ionization-of-mg-acceptors-in-algan-short-period-superlattices-with-high-al-mole-fraction
Mg-doped AlGaN short-period superlattices with a high aluminum mole fraction are promising to fabricate highly efficient deep UV light emitting diodes. We present a robust and easy-to-implement…
Mode competition in broad-ridge-waveguide lasers
/forschung/publikationen/mode-competition-in-broad-ridge-waveguide-lasers-1
The lateral brightness achievable with high-power GaAs-based laser diodes having long and broad waveguides is commonly regarded to be limited by the onset of higher-order lateral modes. For the study…
Shifted excitation Raman difference spectroscopy: A promising tool for the investigation of soil
/forschung/publikationen/shifted-excitation-raman-difference-spectroscopy-a-promising-tool-for-the-investigation-of-soil
In this paper we demonstrate shifted excitation Raman difference spectroscopy (SERDS) for soil analysis as a proof of concept. Confocal Raman microscopy is performed for sample analysis as well as…
Compact and Highly Efficient Kilowatt Lumped Push-Pull Power Amplifier for Cyclotron in Radioisotopes Production
/forschung/publikationen/compact-and-highly-efficient-kilowatt-lumped-push-pull-power-amplifier-for-cyclotron-in-radioisotopes-production
This article presents a very compact highly efficient solid-state power amplifier (SSPA) module at kilowatt level in a push-pull architecture. This SSPA is intended to be used as a modular RF source…
The Bose-Einstein Condensate and Cold Atom Laboratory
/forschung/publikationen/the-bose-einstein-condensate-and-cold-atom-laboratory
Microgravity eases several constraints limiting experiments with ultracold and condensed atoms on ground. It enables extended times of flight without suspension and eliminates the gravitational sag…
Semimetal to semiconductor transition in Bi/TiO2 core/shell nanowires
/forschung/publikationen/semimetal-to-semiconductor-transition-in-bitio2-coreshell-nanowires
We demonstrate the full thermoelectric and structural characterization of individual bismuth-based (Bi-based) core/shell nanowires. The influence of strain on the temperature dependence of the…
Connecting Chips With More Than 100 GHz Bandwidth
/forschung/publikationen/connecting-chips-with-more-than-100-ghz-bandwidth
Connecting chips within a module is a basic requirement in transforming MMIC performance to system functionality. More and more applications demand for operation at high mm-wave frequencies or with…
High-Brightness Nanosecond-Pulse Operation From Tapered-Ridge-Waveguide Lasers
/forschung/publikationen/high-brightness-nanosecond-pulse-operation-from-tapered-ridge-waveguide-lasers
Carrier-induced anti-guiding effects emerging at extremely high injection current densities under short-pulse operation necessitate lateral-waveguide design considerations, that differ from those…
A 310 nm Optically Pumped AlGaN Vertical-Cavity Surface-Emitting Laser
/forschung/publikationen/a-310-nm-optically-pumped-algan-vertical-cavity-surface-emitting-laser
Ultraviolet light is essential for disinfection, fluorescence excitation, curing, and medical treatment. An ultraviolet light source with the small footprint and excellent optical characteristics of…