F. Völklein
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View article: Thermoelectric transport properties of Si, SiGe, and silicide CMOS-compatible thin films
Thermoelectric transport properties of Si, SiGe, and silicide CMOS-compatible thin films Open
Characterization of thermoelectric transport properties for temperature sensing, cooling, and energy harvesting applications is necessary for a reliable device performance in progressively minimized computer chips. In this contribution, we…
View article: Identification and Affinity Determination of Protein-Antibody and Protein-Aptamer Epitopes by Biosensor-Mass Spectrometry Combination
Identification and Affinity Determination of Protein-Antibody and Protein-Aptamer Epitopes by Biosensor-Mass Spectrometry Combination Open
Analytical methods for molecular characterization of diagnostic or therapeutic targets have recently gained high interest. This review summarizes the combination of mass spectrometry and surface plasmon resonance (SPR) biosensor analysis f…
View article: Obtaining simultaneously high crystallinity and sub-bandgap absorption in femtosecond laser hyperdoped black silicon using ion beam etching
Obtaining simultaneously high crystallinity and sub-bandgap absorption in femtosecond laser hyperdoped black silicon using ion beam etching Open
Femtosecond laser sulfur hyperdoped silicon (fs-hSi) is capable of absorbing photons in the infrared spectral range while simultaneously exhibiting negligible reflection. However, laser processing creates detrimental amorphous and polycrys…
View article: Effects of Size Reduction on the Electrical Transport Properties of 3D Bi Nanowire Networks
Effects of Size Reduction on the Electrical Transport Properties of 3D Bi Nanowire Networks Open
3D nanowire networks are fascinating systems for future microelectronic devices. They can be handled like macroscopic objects, while exhibiting properties of nanoscale materials. Here, the fabrication of free‐standing 3D bismuth nanowire n…
View article: Homogeneous Intensity within the Rayleigh Length and Enhanced Depth of Focus for Gaussian Beams
Homogeneous Intensity within the Rayleigh Length and Enhanced Depth of Focus for Gaussian Beams Open
The smallest width of a Gaussian beam at the focal plane is called waist and is only limited by the diffraction limit of the light. The waist determines the Rayleigh length which is the distance from the waist at which the width of the Gau…
View article: Design and Manufacturing Method of Fundamental Beam Mode Shaper for Adapted Laser Beam Profile in Laser Material Processing
Design and Manufacturing Method of Fundamental Beam Mode Shaper for Adapted Laser Beam Profile in Laser Material Processing Open
Many laser material processing applications require an optimized beam profile, e.g., ring shape or Top-Hat profiles with homogeneous intensity distribution. In this study, we show a beam shaping concept leading to a phase shifting element …
View article: LPCVD in-situ doped silicon for thermoelectric applications
LPCVD in-situ doped silicon for thermoelectric applications Open
In semiconductor industry doping of polysilicon materials is often achieved with ion-implantation, provoking a relatively high thermal budget. In this study we have analyzed an alternative approach via LPCVD in-situ phosphorus doping with …
View article: Phase gratings with tunable diffraction efficiency
Phase gratings with tunable diffraction efficiency Open
We present a new principle for tuning the diffraction efficiency of an optical grating and its implementation in a micro-optical device. The overlap of two phase gratings is used to vary the effective phase shift and hence the diffraction …