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Antenna-Coupled Terahertz Field-Effect Transistor Array for Video and Multi-Spectral Imaging
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Researchers demonstrated that silicon antenna-coupled terahertz field-effect transistor arrays can perform video-rate (25 fps) digital imaging and multi-spectral imaging in transmission mode, with potential applications in non-destructive detection of contaminants including microplastics in materials.
The suitability of silicon antenna-coupled terahertz field-effect transistor (TeraFETs) array for video-rate digital imaging and multi-spectral imaging is demonstrated in a transmission fashion. The silicon imaging chip contains a digital TeraFET detector array and experimentally performs 25 fps video-rate images using the hollowed-out aluminum mental boards. Using a chopped tunable terahertz wave source, the last-column TeraFETs with a set of discrete frequencies are applied in raster-scan spectral imaging and obtain the spatial distribution of spectral transmission properties in the samples, offering an elegant solution for identifying microplastic materials packed in a container. Our report allows for optimizing compact and cost-effective noninvasive inspection applications with high frame rates combined with spectroscopic analysis.
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Development of a Compact and Portable Terahertz Imaging System for Industrial Applications
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Researchers developed a compact, portable terahertz imaging device suitable for use outside the laboratory, demonstrating its ability to detect microplastics in soil among a range of other applications. While microplastic detection is one of several uses tested, the availability of low-cost, field-deployable detection technology could support faster and broader environmental monitoring of microplastic contamination.
Detection and analysis of soil contaminants by terahertz time-domain spectroscopy
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This study characterized the optical properties of soil contaminants including heavy metals and microplastics using terahertz time-domain spectroscopy. The research demonstrates terahertz spectroscopy as a new technical approach for assessing soil contamination.
Identification and classification of polyethylene, polyvinyl chloride and low-density polyethylene microplastics using terahertz imaging based on terahertz frequency-domain spectroscopy system
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Scientists used a special light imaging technique (terahertz waves) to spot and tell apart different types of microplastics mixed together, without needing to sort or prepare samples first. This matters because faster, easier microplastic detection could help researchers better track these tiny pollutants that end up in our food, water, and eventually our bodies.
Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy
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Researchers demonstrated that terahertz spectroscopy can detect microplastics embedded in table salt at different concentrations. This technology could offer a new non-destructive method for screening food products for microplastic contamination.
Microplastic detection in soil by THz Time-Domain hyperspectral imaging combined with unsupervised learning analysis
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Researchers applied terahertz time-domain hyperspectral imaging combined with multiple unsupervised machine-learning algorithms to detect and spatially map low-density polyethylene microplastics in soil, demonstrating that all five methods consistently separated plastic from soil without requiring labeled training data, establishing a reference-free detection approach.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.