A5012788086- Terahertz technology and applications
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Insect and Arachnid Ecology and Behavior
- Superconducting and THz Device Technology
- Photonic Crystals and Applications
- Plant and animal studies
- Microwave Engineering and Waveguides
- Gyrotron and Vacuum Electronics Research
- 3D IC and TSV technologies
- Neuroscience and Neural Engineering
- Insect and Pesticide Research
- Advanced Fiber Laser Technologies
- Infrared Thermography in Medicine
- Fire Detection and Safety Systems
- Microwave and Dielectric Measurement Techniques
- Advanced MEMS and NEMS Technologies
- Thermography and Photoacoustic Techniques
- Electromagnetic Scattering and Analysis
- Metamaterials and Metasurfaces Applications
- Advanced Chemical Sensor Technologies
- Biofield Effects and Biophysics
- Millimeter-Wave Propagation and Modeling
- Optical Imaging and Spectroscopy Techniques
University of Duisburg-Essen
2020-2025
In this paper, new concepts for continuous 24/7 real-time monitoring of plants and insects with miniaturized terahertz (THz) systems are described experimentally tested. Thus, the first time, small-scale insights into instantaneous plant health but also in their long-term growth can be obtained. Using such compact THz systems, e.g. water uptake, insect infestation behavior pollinators (i.e. honey bees) pests measured dynamically non-invasively at virtually any position close biotope...
Terahertz time-domain spectroscopy (THz-TDS) is a promising tool for high-resolution 3D imaging of objects due to the high center frequency and bandwidth compared microwave systems. In addition, terahertz waves have higher penetration depth than visible or near-infrared radiation. Typically, optics are used focus radiation onto an object under test. This limits capability in axial dimension field simple complex surfaces. this work, we adapt backpropagation algorithm from synthetic aperture...
Terahertz (THz) technology provides precise monitoring capabilities in dynamic environments, offering unique insights into insect habitats. Our study focuses on environmental of European honey bees (Apis mellifera) through a combination measurements and simulations. Initially, the dielectric material properties bee body parts are characterized across spectral range 1-500 GHz to collect heterogeneous empirical data. To extend study, mockups made from polyamide 12 (PA12) epoxy resin employed...
Terahertz time-domain spectroscopy (THz-TDS) has emerged as a powerful and versatile tool in various scientific fields. These include-among others-imaging, material characterization, layer thickness measurements. While THz-TDS achieved significant success research environments, the high cost bulky nature of most systems have hindered widespread commercialization this technology. Two primary factors contributing to size these are laser optical delay unit (ODU). Consequently, our group focused...
Terahertz time-domain spectroscopy enables the extraction of electrical properties from materials. An complex permittivity can be carried out with measurements in transmission or reflection geometry enabling identification To perform an exact identification, sample thickness and angle incidence terahertz radiation must known. However, when those parameters are unknown additionally materials show strong absorbances, a precise differentiation between is challenging. A promising approach use...
Abstract In this paper, we present a terahertz transmission frequency-selective quasi surface (FSQS) that exhibits strong absorption lines and periodic band-pass characteristic. The FSQS structure is created by laterally combining Fabry-Pérot resonators with different thicknesses. transfer function of the can serve as broadband reference for testing signal integrity path systems. achieves combination characteristics sharp resonances theoretical attenuation over 80 dB quality factors more...
Abstract The possibility of establishing a novel technique for reliably accessing glycemic information in non-invasive, easy to implement method at THz frequencies via the fingernail bed is investigated. nail bed’s major content blood its various glucose levels and also partially protected from environmental conditions by plate, making it desirable platform non-invasive sensing. study based on 2D computational electromagnetics (EM) model layered COMSOL Multiphysics, where required dielectric...
THz oscillators with on-chip antennas containing no ground plane are affected by substrate modes and therefore undirected radiation into free space. When integrating such focusing lenses, accurate sub-μm alignment is required. This work presents an assembly process utilizing HRFZ-Si transfer between the InP RTD chip a hyper-hemispherical silicon lens, enabling precise alignment. We developed bonding for 1.2 × mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A simple broadband terahertz transmission filter with strong absorption lines and medium attenuation is introduced. The 3D printed using a low-loss cyclic olefin copolymer (COC) filament characterized time-domain frequency-domain spectroscopy system.
This paper presents to our knowledge the first high-resolution 3D reconstruction in terahertz frequency range using an inverse spherical synthetic aperture. A wide-bandwidth time-domain spectroscopy system with antennas operating divergent reflection geometry is used together a low-cost 3D-printed device rotate object azimuth and elevation. The method evaluated by performing of 20-sided metal dice. obtained resolution 50 $\mu$m all directions.
This paper presents the design, simulation, fabrication, and measurement of a pyramidal absorber for terahertz frequency range. The fabrication is carried out by 3D-printing with resin printer enabling high resolution structures an accuracy 35 µm. vector network analyzer agrees simulation shows broadband absorption 50 dB above 250 GHz.
Spectroscopy is a widely used tool for material characterization and classification across all frequencies of the electromagnetic spectrum. Depending on frequency employed, absorption losses become limiting factor penetration depth under test (MUT). Water, in particular, exhibits strong terahertz range, necessitating extended averaging times. In this study, we present time-domain spectroscopy (THz-TDS) measurements conducted varying thicknesses water, using our self-built, compact...
In recent decades, research has focused on sources and detectors in the terahertz frequency range. Now that high-performance systems are available, development of passive components is coming to fore. Additive manufacturing polymer ceramic structures represents a major opportunity. Various concepts for guiding manipulating electromagnetic waves 3D-printed presented by simulation experiment.
We employ an artificial neural network to classify typical indoor materials with a lensless terahertz time-domain spectroscopy (THz TDS) system operated in reflection mode. Nine different dielectric can be successfully classified accuracy of more than 80%.
In this work, we demonstrate a 3-D printed platform using cyclic olefin copolymer to measure ceramic photonic crystal waveguide. An operating range from 150 GHz 200 was achieved with highly efficient coupling terahertz spectrometer into the and sample. The measurement results agree simulation results.
In this paper, an approach for automated material mapping based on neural networks terahertz images is proposed. The classification method applied focused transmission measurements of a time-domain spectroscopy (THz-TDS) system 13 different 3-D printed polymers. With our approach, accuracy around 95 % was achieved.
Abstract Terahertz time-domain spectroscopy (THz-TDS) has emerged as a powerful and versatile tool in various scientific fields. These include – among others imaging, material characterization, layer thickness measurements. While THz-TDS achieved significant success research environments, the high cost bulky nature of most systems have hindered widespread commercialization this technology. Two primary factors contributing to size these are laser optical delay unit (ODU). Consequently, our...