Nico Vieweg
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View article: Terahertz photonic heterodyne spectral analysis with (sub-) kHz resolution and 6.5 THz frequency coverage
Terahertz photonic heterodyne spectral analysis with (sub-) kHz resolution and 6.5 THz frequency coverage Open
Spectrum analyzers and spectrometers are essential for designing sources, analyzing material properties, layer structures and fingerprinting substances. We present an ultra-wideband, continuous-wave photonic receiver with kHz-level spectra…
Simultaneous charge carrier density mapping of SiC epilayers and substrates with terahertz time-domain spectroscopy Open
With the growing demand for efficient power electronics, SiC-based devices are progressively becoming more relevant. In contrast to established methods such as the mercury capacitance-voltage technique, terahertz spectroscopy promises a co…
Simultaneous Charge Carrier Density Mapping of SiC Epilayers and Substrates with Terahertz Time-Domain Spectroscopy Open
With the growing demand for efficient power electronics, SiC-based devices are progressively becoming more relevant. In contrast to established methods such as the mercury capacitance-voltage technique, terahertz spectroscopy promises a co…
View article: Terahertz photonic heterodyne spectral analysis with (sub-) kHz resolution and 6.5 THz frequency coverage
Terahertz photonic heterodyne spectral analysis with (sub-) kHz resolution and 6.5 THz frequency coverage Open
Spectrum analyzers and spectrometers are essential for exploring extended spectral ranges, designing sources, analyzing material properties, layer structures and fingerprinting substances. We present an ultra-wideband, continuous-wave phot…
Fiber-Coupled THz TDS System With mW-Level THz Power and up to 137-dB Dynamic Range Open
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Wide-range resistivity characterization of semiconductors with terahertz time-domain spectroscopy Open
Resistivity is one of the most important characteristics in the semiconductor industry. The most common way to measure resistivity is the four-point probe method, which requires physical contact with the material under test. Terahertz time…
Wide-range resistivity characterization of semiconductors with terahertz time-domain spectroscopy Open
Resistivity is one of the most important characteristics in the semiconductor industry. The most common way to measure resistivity is the four-point probe method, which requires physical contact with the material under test. Terahertz time…
View article: Ultra-Stable Tunable THz System for 6G Communication Based on Photonics
Ultra-Stable Tunable THz System for 6G Communication Based on Photonics Open
The high frequency region beyond 100 GHz considered for 6G poses challenges for future communication and measurement equipment. In this work we present a novel tunable THz system based on ultra-stable photonic sources and optical frequency…
View article: Online thickness measurements of acrylate-based coatings on knitted polyester fabric using terahertz time-domain spectroscopy
Online thickness measurements of acrylate-based coatings on knitted polyester fabric using terahertz time-domain spectroscopy Open
Three different institutions combined their expertise in a joint R&D project to demonstrate the suitability of terahertz time-domain spectroscopy for thickness measurements of acrylate-based coatings on polyester fabric. First, we spectros…
A Terahertz Fast-Sweep Optoelectronic Frequency-Domain Spectrometer: Calibration, Performance Tests, and Comparison with TDS and FDS Open
We report calibration and performance tests of a terahertz fast-sweep optoelectronic frequency-domain spectrometer designed for industrial applications, aimed at quantifying its performance specifications and demonstrating its suitability …
Kilohertz Pixel-Rate Multilayer Terahertz Imaging of Subwavelength Coatings Open
The acquisition speed of terahertz time-domain spectroscopy systems has undergone a significant improvement in recent years. With the development of dual-laser-based sampling techniques such as ASOPS or ECOPS, waveform acquisition rates in…
Industrial Applications of Terahertz Sensing: State of Play Open
This paper is a survey of existing and upcoming industrial applications of terahertz technologies, comprising sections on polymers, paint and coatings, pharmaceuticals, electronics, petrochemicals, gas sensing, and paper and wood industrie…
Fastest Thickness Measurements with a Terahertz Time-Domain System Based on Electronically Controlled Optical Sampling Open
We apply a fast terahertz time-domain spectroscopy (TDS) system based on electronically controlled optical sampling (ECOPS) to contact-free thickness gauging. Our setup achieves a measurement speed of 1600 terahertz pulse traces per second…
International System of Units (SI) Traceable Noise-Equivalent Power and Responsivity Characterization of Continuous Wave ErAs:InGaAs Photoconductive Terahertz Detectors Open
A theoretical model for the responsivity and noise-equivalent power (NEP) of photoconductive antennas (PCAs) as coherent, homodyne THz detectors is presented. The model is validated by comparison to experimental values obtained for two ErA…
High Resolution Lensless Terahertz Imaging and Ranging Open
In this paper, we propose a fast terahertz time-domain imaging method using a radar migration algorithm. We demonstrate high-resolution imaging in reflection without any collimating or focusing optics in the terahertz beam. In the proposed…
Towards Quality Control in Pharmaceutical Packaging: Screening Folded Boxes for Package Inserts Open
We applied a recently developed, ultrafast terahertz measurement technique to screen folded cardboard boxes for package inserts. The presence or absence of an enclosed leaflet could be detected unambiguously in samples moving at velocities…
A Flexible Phase-Insensitive System for Broadband CW-Terahertz Spectroscopy and Imaging Open
We present a compact, robust, and flexible continuous-wave (CW) terahertz system, ideally suited for both imaging and high-resolution broadband spectroscopy. The setup employs an incoherent detection scheme: A photomixer transmitter is com…