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X-ray characterization of an Esaki-Tsu superlattice and transport properties

/forschung/publikationen/x-ray-characterization-of-an-esaki-tsu-superlattice-and-transport-properties

We have studied, by x-ray scattering, structural parameters of a short-period GaAs/AlAs superlattice and related the parameters to electric transport properties. Our results, for a superlattice…

Characterization of Laser Structures by EBIC Measurements and Simulation

/forschung/publikationen/characterization-of-laser-structures-by-ebic-measurements-and-simulation

The electron beam induced current (EBIC) profiles of laser structures based on InGaAsP/InGaP/GaAs show a main peak and an additional shoulder or peak. To understand this phenomenom EBIC profiles at…

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/forschung/publikationen/in-situ-characterization-of-strain-distribution-in-broad-area-high-power-lasers-under-operation-by-high-resolution-x-ray-diffraction-and-topography-using-synchrotron-radiation-1

Shift and shape of grating diffracted beams

/forschung/publikationen/shift-and-shape-of-grating-diffracted-beams

The grating diffraction of beams is theoretically investigated by applying an electromagnetic method (the Integral Equation System Method with Parametrization of the grating profile = IESMP) to their…

Beam propagation in an active planar waveguide with an angled bragg grating (α laser)

/forschung/publikationen/beam-propagation-in-an-active-planar-waveguide-with-an-angled-bragg-grating-alpha-laser

In the angled Bragg grating semiconductor laser (α laser), light does not propagate at a right angle with respect to the two-dimensional corrugated grating of the planar waveguide. A closed-form…

Zonal diffraction efficiencies and imaging of micro-Fresnel lenses

/forschung/publikationen/zonal-diffraction-efficiencies-and-imaging-of-micro-fresnel-lenses

The dependence of the zonal efficiency of a transmission Fresnel lens on the number of quantization levels and on the polarization of the light, without and with an antireflection (AR) overcoating is…

Photoluminescence on ordered GaxIn1-xAsyP1-y

/forschung/publikationen/photoluminescence-on-ordered-gaxin1-xasyp1-y

Photoluminescence of Ga0.54In0.46As0.12P0.88 layers grown by metalorganic vapor phase epitaxy on differently oriented GaAs substrates has been investigated. Valence-band splitting due to symmetry…

Ohmic Pd/Zn/Au/LaB6/Au contacts on p-type In0.53Ga0.47As: Electrical and metallurgical properties

/forschung/publikationen/ohmic-pdznaulab6au-contacts-on-p-type-in053ga047as-electrical-and-metallurgical-properties

The development of a shallow and low-resistive contact on moderately doped (p≈5×1018 cm-3 In0.53Ga0.47As is demonstrated. By reducing the layer thicknesses of a conventional…

Low resistance, thermally stable Au/Pt/Ti/WSiN ohmic contacts on n+-InGaAs/n-GaAs layer systems

/forschung/publikationen/low-resistance-thermally-stable-aupttiwsin-ohmic-contacts-on-n-ingaasn-gaas-layer-systems

The electrical properties of the ohmic contact systems Au/Pt/Ti/WSiN and Au/Pt/Ti to n+-InGaAs/GaAs layers grown by metalorganic vapor phase epitaxy were investigated and compared to each other. The…

Review and experimental benchmarking of machine learning algorithms for efficient optimization of cold atom experiments

/forschung/publikationen/review-and-experimental-benchmarking-of-machine-learning-algorithms-for-efficient-optimization-of-cold-atom-experiments

The generation of cold atom clouds is a complex process which involves the optimization of noisy data in high dimensional parameter spaces. Optimization can be challenging both in and especially…