- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 International Conference and Exposition on Electrical And Power Engineering (EPE) - Iasi, Romania (2018.10.18-2018.10.19)] 2018 International Conference and Exposition on Electrical And Power Engineering (EPE) - Advanced Image Processing in Support of THz Imaging for Early Detection of Gastric Cancer
摘要： Gastric tumors are still late diagnosed and represent min. 17% of cases leading to metastasis. The ability to visualize the mucosa of the gastrointestinal tract in detail is a requisite for early detection of dysplasia and cancer. Although techniques such as chromoendoscopy, high resolution and magnification endoscopy, narrow band imaging, auto-fluorescence imaging improve the visualization and detection of mucosal lesions, biopsy of the targeted lesion must still be performed for a formal histological diagnosis of cellular and architectural atypical.
关键词： gastric cancer,image processing,THz imaging
更新于2025-09-23 15:22:29
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Refractive Index Sensing Research on Multi-Fano-Based Plasmonic MDM Resonant System With Water-Based Dielectric
摘要： In this letter, we report initial experimental results which provide the foundation for low-terahertz (low-THz) radar imagery for outdoor unstructured scenarios as expected in automotive sensing. The requirements and speci?cations for a low-THz single imaging radar sensor are brie?y outlined. The imaging capabilities of frequency-modulated continuous-wave (FMCW) radar operating at 150 GHz are discussed. A comparison of experimental images of on-road and off- road scenarios made by a 150-GHz FMCW radar and a reference 30-GHz stepped-frequency radar is implemented, and their performance is analyzed.
关键词： low terahertz (low-THz),Imaging radar
更新于2025-09-23 15:21:01
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[IEEE 2019 Compound Semiconductor Week (CSW) - Nara, Japan (2019.5.19-2019.5.23)] 2019 Compound Semiconductor Week (CSW) - Breakdown of Pauli spin blockade by phonon irradiation in a GaAs double quantum dot
摘要： In this letter, we report initial experimental results which provide the foundation for low-terahertz (low-THz) radar imagery for outdoor unstructured scenarios as expected in automotive sensing. The requirements and speci?cations for a low-THz single imaging radar sensor are brie?y outlined. The imaging capabilities of frequency-modulated continuous-wave (FMCW) radar operating at 150 GHz are discussed. A comparison of experimental images of on-road and off- road scenarios made by a 150-GHz FMCW radar and a reference 30-GHz stepped-frequency radar is implemented, and their performance is analyzed.
关键词： low terahertz (low-THz),Imaging radar
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Shunt Resistance Relation to Power Loss due to Potential Induced Degradation in Crystalline Photovoltaic Cells
摘要： In this letter, we report initial experimental results which provide the foundation for low-terahertz (low-THz) radar imagery for outdoor unstructured scenarios as expected in automotive sensing. The requirements and speci?cations for a low-THz single imaging radar sensor are brie?y outlined. The imaging capabilities of frequency-modulated continuous-wave (FMCW) radar operating at 150 GHz are discussed. A comparison of experimental images of on-road and off- road scenarios made by a 150-GHz FMCW radar and a reference 30-GHz stepped-frequency radar is implemented, and their performance is analyzed.
关键词： low terahertz (low-THz),Imaging radar
更新于2025-09-23 15:21:01
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[IEEE ESSCIRC 2019 - IEEE 45th European Solid State Circuits Conference (ESSCIRC) - Cracow, Poland (2019.9.23-2019.9.26)] ESSCIRC 2019 - IEEE 45th European Solid State Circuits Conference (ESSCIRC) - A Hybrid THz Imaging System With a 100-Pixel CMOS Imager and a 3.25a??3.50 THz Quantum Cascade Laser Frequency Comb
摘要： The terahertz frequency range beyond 3 THz has exciting potential to have a transformative impact in a wide range of applications, including chemical and biomedical sensing, spectroscopy, imaging, and short-distance wireless communication. While there have been significant advancements in silicon-based THz imagers in the frequency ranges below 1 THz, technological development beyond 3 THz has been impeded by the lack of solid-state sources in this frequency range. In addition, the design space beyond 3 THz opens up fundamentally new challenges across electronics and the electromagnetic interface. In this spectral range, the wavelength is small enough (λox ≈ 50 μm at 3 THz) that a vertical via from the top antenna layer to the detector is a distributed element (transmission line or radiator). In this letter, we follow a careful circuits-electromagnetics co-design approach toward a hybrid imaging system with a 100-pixel CMOS imager that interfaces with a THz quantum cascade laser frequency comb that spans 3.25–3.5 THz with mode spacing of 17 GHz. The array chip, while designed for an optimal operation across 2.7–2.9 THz, demonstrates an average noise equivalent power (NEP) (across pixels) of 1260 pW/√Hz between 3.25–3.5 THz and a projected NEP of 284 pW/√Hz across the design range of 2.7–2.9 THz. To the best of our knowledge, we demonstrate for the first time full THz imaging in a hybrid quantum cascade laser (QCL)–CMOS fashion. This approach allows future works to leverage both QCL and CMOS technologies to demonstrate new technological advances for systems in the 1–10 THz range.
关键词： quantum cascade laser,THz imaging,terahertz,detector,imaging,CMOS,silicon,hybrid imaging
更新于2025-09-23 15:19:57
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Metalized Poly-methacrylate Off-Axis Parabolic Mirrors for Terahertz Imaging Fabricated by Additive Manufacturing
摘要： Terahertz radiation sources are currently one of the most widely used non-ionizing illumination mechanisms for security applications and also find increasing utilization in quality control of commercial products. Presently, a majority of these applications rely on scanning rather than direct imaging and implicitly suffer from temporal latency due to post processing. The monetary and temporal cost associated with procuring commercially manufactured optics that are suitable for imaging leads to fundamental limitations in the ability to rapidly develop application-specific imaging modalities using terahertz sources. Herein, we show a novel method for the rapid prototyping of metallic coated poly-methacrylate parabolic reflectors fabricated by stereolithographic 3D printing. Images comparing the performance of a commercially available off-axis parabolic reflector to our metalized poly-methacrylate prototype, which was designed to be identical to the commercially available mirror, are subsequently presented. The images show that at 530 GHz it is possible to produce a metalized poly-methacrylate off-axis paraboloid whose spatial beam profile is nearly identical to that of a commercially available equivalent.
关键词： Rapid prototyping,3D printing,THz imaging
更新于2025-09-19 17:15:36
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A Hybrid THz Imaging System With a 100-Pixel CMOS Imager and a 3.25–3.50 THz Quantum Cascade Laser Frequency Comb
摘要： The terahertz frequency range beyond 3 THz has exciting potential to have a transformative impact in a wide range of applications, including chemical and biomedical sensing, spectroscopy, imaging, and short-distance wireless communication. While there have been significant advancements in silicon-based THz imagers in the frequency ranges below 1 THz, technological development beyond 3 THz has been impeded by the lack of solid-state sources in this frequency range. In addition, the design space beyond 3 THz opens up fundamentally new challenges across electronics and the electromagnetic interface. In this spectral range, the wavelength is small enough (λox ≈ 50 μm at 3 THz) that a vertical via from the top antenna layer to the detector is a distributed element (transmission line or radiator). In this letter, we follow a careful circuits-electromagnetics co-design approach toward a hybrid imaging system with a 100-pixel CMOS imager that interfaces with a THz quantum cascade laser frequency comb that spans 3.25–3.5 THz with mode spacing of 17 GHz. The array chip, while designed for an optimal operation across 2.7–2.9 THz, demonstrates an average noise equivalent power (NEP) (across pixels) of 1260 pW/√Hz between 3.25–3.5 THz and a projected NEP of 284 pW/√Hz across the design range of 2.7–2.9 THz. To the best of our knowledge, we demonstrate for the first time full THz imaging in a hybrid quantum cascade laser (QCL)–CMOS fashion. This approach allows future works to leverage both QCL and CMOS technologies to demonstrate new technological advances for systems in the 1–10 THz range.
关键词： hybrid imaging,quantum cascade laser,silicon,THz imaging,CMOS,terahertz,imaging,detector
更新于2025-09-11 14:15:04
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[IEEE 2018 10th International Conference on Information Technology and Electrical Engineering (ICITEE) - Bali, Indonesia (2018.7.24-2018.7.26)] 2018 10th International Conference on Information Technology and Electrical Engineering (ICITEE) - Cascaded-optimum Matching Layer for Planar Bowtie Terahertz Antenna on Extended Hemispherical High Dielectric Lens
摘要： Development of THz technology has been an interest research topic over the past decade due to its unique radiation characteristic. Recent development in THz technology enables THz radiation for various imaging applications such as remote sensing, biomedical and security detection because it has decent advantages over the old techniques of X-Ray and microwave imaging. For imaging applications, a system must meet the requirement of a high gain or narrow beamwidth radiation to produce a high-resolution spectra output. A high radiation efficiency is also the considered parameter because it will affect the amount of the radiated energy to the target. The matching layer (ML) technique is a common technique to minimize the internal reflections and improve the radiation efficiency performance of the optical based antenna such as lens. In the previous research, we have studied a bow-tie planar antenna combined with Silicon dielectric substrate and extended hemispherical lens for 1 THz resonant frequency. The ML method has also been applied in both single and cascaded technique to increase the radiation efficiency. However, the complexity of the design is one of the main concern because high number of stacked MLs used to achieve maximum radiation efficiency. In this paper, we study the effect of an optimum ML to the lens antenna. An optimum ML has different layer thickness among the lens surface to covers the different angle of incidence. From the simulation results, radiation efficiency can be increased up to 92.06% while the high gain performance can be kept consistent around 32 dB with a narrow beamwidth of below (cid:2)(cid:3). It shows that our proposed design is suitable for future THz imaging applications.
关键词： internal reflections,THz imaging,Silicon,matching layer
更新于2025-09-10 09:29:36
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AIP Conference Proceedings [Author(s) INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2018 (ICCMSE 2018) - Thessaloniki, Greece (14–18 March 2018)] - Investigation of terajets produced by dielectric parallelepiped structure
摘要： In this article the generalized results of full width at half-maximum intensity (FWHM) of the “terajets” are presented for a parallelepiped structure made of eight different photopolymers in the frequency range of 0.04-0.2 THz. Its S-parameters were obtained in COMSOL Multiphysics software. After the analysis of the transmission and reflection spectra the “terajet” effect was observed at the specific resonance frequencies. This gives us an opportunity to predict this effect and create narrow-band devices based on it in THz imaging and sensing.
关键词： sensing,photopolymers,THz imaging,COMSOL Multiphysics,dielectric parallelepiped structure,terajets
更新于2025-09-09 09:28:46
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[IEEE 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz2018) - Nagoya, Japan (2018.9.9-2018.9.14)] 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - A THz Imaging System Using Sparse Antenna Array for Security Screening
摘要： This paper presents our study on a THz imaging system using a sparse periodic linear antenna array (SPA) with large element spacing, consisting of only 14 transmitters and 16 receivers at 220GHz to achieve a horizontal field of view (FOV) of about 0.8m. The image of a realistic target scenario, i.e. the metallic objects concealed under a thin clothing in front of a human body phantom is reconstructed with data from an effective simulation based on a combined method between moment and ray launching-geometrical optics (RL-GO) algorithms in FEKOTM. The results have shown that a resolution of 3.5mm at 4m distance can be achieved in this THz imaging system. In addition, the study demonstrates compressive sensing (CS) reconstruction method is capable to provide a comparable image quality with a dramatic reduction of sampling data, which can also be applied in practical products to improve the imaging rate.
关键词： compressive sensing,THz imaging,security screening,sparse antenna array
更新于2025-09-09 09:28:46