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A Waveguide Power Divider With Zebra Chip and Isolated Output Ports for 400–510 GHz 采用斑马芯片和隔离输出端口的400-510 GHz波导分压器
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-04-01 Epub Date: 2026-01-12 DOI: 10.1109/TTHZ.2025.3648670
Matthias Justen;Felix Münning;Michael Schultz;Cornelia E. Honingh;Urs U. Graf
{"title":"A Waveguide Power Divider With Zebra Chip and Isolated Output Ports for 400–510 GHz","authors":"Matthias Justen;Felix Münning;Michael Schultz;Cornelia E. Honingh;Urs U. Graf","doi":"10.1109/TTHZ.2025.3648670","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3648670","url":null,"abstract":"We present a broadband waveguide power divider for the 400–510 GHz band with low insertion loss and good isolation between the output ports. It is used in the LO distribution system of the CHAI LFA heterodyne receiver for the CCAT observatory to feed 32 balanced SIS mixers with each LO source. A silicon membrane chip with a zebra stripe pattern of resistive titanium nitride (TiN) is placed at the tip of the split block waveguide Y-junction to improve the isolation.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 4","pages":"457-462"},"PeriodicalIF":3.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Create Change: IEEE 创造改变：IEEE
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-04-01 Epub Date: 2026-04-03 DOI: 10.1109/TTHZ.2026.3678673
{"title":"Create Change: IEEE","authors":"","doi":"10.1109/TTHZ.2026.3678673","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3678673","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 4","pages":"499-499"},"PeriodicalIF":3.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11474712","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IEEE Transactions on Terahertz Science and Technology Information for Authors IEEE太赫兹科技信息汇刊
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-04-01 Epub Date: 2026-04-03 DOI: 10.1109/TTHZ.2026.3678669
{"title":"IEEE Transactions on Terahertz Science and Technology Information for Authors","authors":"","doi":"10.1109/TTHZ.2026.3678669","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3678669","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 4","pages":"496-497"},"PeriodicalIF":3.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11474710","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IEEE Microwave Theory and Techniques Society Information IEEE微波理论与技术学会信息
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-04-01 Epub Date: 2026-04-03 DOI: 10.1109/TTHZ.2026.3676637
{"title":"IEEE Microwave Theory and Techniques Society Information","authors":"","doi":"10.1109/TTHZ.2026.3676637","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3676637","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 4","pages":"C2-C2"},"PeriodicalIF":3.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11474692","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-Power Micro-Optical Bench Terahertz Quantum-Cascade Laser System 高功率微光台架太赫兹量子级联激光系统
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-04-01 Epub Date: 2026-02-03 DOI: 10.1109/TTHZ.2026.3660256
Robert Voigt;Martin Wienold;Xiang Lü;Lutz Schrottke;Klaus Biermann;Alexander Sahm;Katrin Paschke;Heinz-Wilhelm Hübers
{"title":"High-Power Micro-Optical Bench Terahertz Quantum-Cascade Laser System","authors":"Robert Voigt;Martin Wienold;Xiang Lü;Lutz Schrottke;Klaus Biermann;Alexander Sahm;Katrin Paschke;Heinz-Wilhelm Hübers","doi":"10.1109/TTHZ.2026.3660256","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3660256","url":null,"abstract":"We report on compact high-power terahertz quantum-cascade laser systems. By integrating the optical components, namely, a lens, a polarization filter, and a <inline-formula><tex-math>$lambda /4$</tex-math></inline-formula> waveplate, on a micro-optical bench, we achieve optical isolation as well as beamforming while maintaining high output power without the need of additional optical elements. In the future, such quantum-cascade laser systems might be implemented as local oscillators in heterodyne receivers for space applications.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 4","pages":"482-486"},"PeriodicalIF":3.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Terahertz Time-Domain Spectroscopy for the Characterization of Dielectrics and Foams Using Amplitude and Phase in Reflection Mode 太赫兹时域光谱在反射模式下的振幅和相位表征电介质和泡沫
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-04-01 Epub Date: 2025-11-25 DOI: 10.1109/TTHZ.2025.3629861
Silvia Tofani;Walter Fuscaldo;Tiziana Ritacco;Romeo Beccherelli;Dimitrios C. Zografopoulos
{"title":"Terahertz Time-Domain Spectroscopy for the Characterization of Dielectrics and Foams Using Amplitude and Phase in Reflection Mode","authors":"Silvia Tofani;Walter Fuscaldo;Tiziana Ritacco;Romeo Beccherelli;Dimitrios C. Zografopoulos","doi":"10.1109/TTHZ.2025.3629861","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3629861","url":null,"abstract":"Amplitude-only measurements have recently been proposed to avoid phase sensitivity issues in terahertz (THz) time-domain spectroscopy (TDS) in reflection mode. These methods, however, are typically applied to open-boundary setups and may fail in scenarios where the Fabry–Perot interference is weak or absent. Here, we show that phase information can be essential in the characterization of low-index materials, such as dielectric foams. We address this limitation by focusing on a grounded Fabry–Perot configuration (i.e., a reflective backplane geometry), which enhances spectral features and allows for full exploitation of both amplitude and phase information. To this end, two effective protocols are developed here to accurately determine the complex permittivity of dielectric materials by exploiting both the amplitude and the phase of THz-TDS measurements. The first method fits directly the physical parameters of established permittivity dispersion models describing the unknown material by minimizing the weighted Euclidean norms of the amplitude and phase errors. This convex fitting approach improves convergence stability, especially when interference fringes are weak. The second method first estimates the optimal real permittivity values from the phase measurements, and then the loss tangent from the amplitude measurements. These mathematical values are then fitted through a suitable permittivity model to ensure causality. Both techniques are tested against materials with different dielectric properties, highlighting the case scenarios in which phase measurements significantly improve the accuracy of material dielectric characterization.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 4","pages":"384-392"},"PeriodicalIF":3.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11269029","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phase Locking a 4.7-THz Quantum Cascade Laser to a Stable Laboratory Synthesizer 4.7太赫兹量子级联激光器锁相稳定实验室合成器
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-04-01 Epub Date: 2026-03-13 DOI: 10.1109/TTHZ.2026.3670539
Sajjad Mahdizadeh;Matthias Justen;Urs U. Graf;Jürgen Stutzki
{"title":"Phase Locking a 4.7-THz Quantum Cascade Laser to a Stable Laboratory Synthesizer","authors":"Sajjad Mahdizadeh;Matthias Justen;Urs U. Graf;Jürgen Stutzki","doi":"10.1109/TTHZ.2026.3670539","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3670539","url":null,"abstract":"We demonstrate phase locking of a 4.7 THz distributed feedback quantum cascade laser (QCL) to a stable laboratory synthesizer. The QCL operates at 4747.9 GHz with 1 mW output power, mounted on the first stage of a pulse-tube cryocooler with mechanical dampers. Despite residual mechanical vibrations, the QCL radiation is successfully coupled out through a series of cold and warm mirrors and focused onto a room-temperature superlattice diode (SLD). The SLD is pumped by a 182.6 GHz signal from a diode frequency multiplier chain and generates the 26th harmonic at 4748.2 GHz for harmonic mixing as a phase reference. This produces a 327 MHz intermediate frequency that is amplified, filtered, and fed to a balanced diode mixer phase detector. The phase-locked loop (PLL) employs a loop filter to generate correction signals for QCL current adjustment, reducing the unlocked linewidth from approximately 10 MHz to 1 Hz (limited by resolution bandwidth of the spectrum analyzer). In addition of providing absolute frequency reference and ability of introducing fine frequency steps, the system demonstrates remarkable robustness, maintaining phase lock for several hours and even under low signal-to-noise conditions such as 1 dB of signal over noise at 3 MHz resolution bandwidth. This robustness comes from tailored PLL design, incorporating a diode ring mixer as a phase detector and a linear phase narrowband filter, and proves its suitability for practical heterodyne array receivers targeting the [OI] line at 4.7 THz.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 4","pages":"476-481"},"PeriodicalIF":3.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IEEE Women in Engineering IEEE工程女性
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-04-01 Epub Date: 2026-04-03 DOI: 10.1109/TTHZ.2026.3678671
{"title":"IEEE Women in Engineering","authors":"","doi":"10.1109/TTHZ.2026.3678671","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3678671","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 4","pages":"500-500"},"PeriodicalIF":3.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11474709","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
50 mm × 50 mm Cesium Atomic Vapor Cell for Terahertz Imaging: Implementation and Application 用于太赫兹成像的50mm × 50mm铯原子蒸汽电池：实现与应用
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-04-01 Epub Date: 2025-12-18 DOI: 10.1109/TTHZ.2025.3646034
Bin Zhang;Jun Wan;Tao Li;Xianzhe Li;Yu Wu;Qirong Huang;Xinyu Yang;Wei Huang;Kaiqing Zhang;Haixiao Deng
{"title":"50 mm × 50 mm Cesium Atomic Vapor Cell for Terahertz Imaging: Implementation and Application","authors":"Bin Zhang;Jun Wan;Tao Li;Xianzhe Li;Yu Wu;Qirong Huang;Xinyu Yang;Wei Huang;Kaiqing Zhang;Haixiao Deng","doi":"10.1109/TTHZ.2025.3646034","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3646034","url":null,"abstract":"Rydberg atomic sensors offer transformative potential for high-speed, high-sensitivity terahertz (THz) imaging. However, previous systems are hindered by restricted imaging areas, largely due to the compact dimension of atomic vapor cells and inefficient beam-shaping methodologies. We present a THz imaging system with a 50 mm × 50 mm area, enabled by a custom-engineered scaled-up atomic vapor cell and an optimized beam-shaping optical architecture. Experimental validation confirms that this system achieves near-diffraction-limited, high-resolution THz imaging at 0.55 THz under ambient conditions. Furthermore, its capabilities are demonstrated through real-time visualization of the diffusion dynamics of a deionized water droplet in anhydrous ethanol. This work not only expands the boundaries of Rydberg atomic sensors, but also establishes a critical foundation for advancing THz imaging technologies toward into real-world, large-scale applications.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 4","pages":"366-373"},"PeriodicalIF":3.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Terahertz Metasurface Temperature Sensor Based on the Integration of Gallium Nitride and High-Temperature-Annealed Strontium Titanate 基于氮化镓和高温退火钛酸锶集成的太赫兹超表面温度传感器
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-04-01 Epub Date: 2025-12-03 DOI: 10.1109/TTHZ.2025.3639513
Xin Yan;Xing Yu Zhang;Xiao Fei Hu;Zhen Hua Li;Lan Ju Liang;Hai Yun Yao;Zi Qun Wang;Hao Meng;Zhao Qing Sun;Wang Zhen Dong;Yong Gang Zhang;Zhao Yang Shi;Fei Huai;Jin Tao Wu;Zhang Zhang
{"title":"Terahertz Metasurface Temperature Sensor Based on the Integration of Gallium Nitride and High-Temperature-Annealed Strontium Titanate","authors":"Xin Yan;Xing Yu Zhang;Xiao Fei Hu;Zhen Hua Li;Lan Ju Liang;Hai Yun Yao;Zi Qun Wang;Hao Meng;Zhao Qing Sun;Wang Zhen Dong;Yong Gang Zhang;Zhao Yang Shi;Fei Huai;Jin Tao Wu;Zhang Zhang","doi":"10.1109/TTHZ.2025.3639513","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3639513","url":null,"abstract":"This study presents a novel terahertz (THz) temperature sensor based on a metallic metasurface integrated with strontium titanate (STO) and gallium nitride (GaN) thin films. The STO films are deposited by magnetron sputtering and annealed at different temperatures. With the increase of annealing temperature, the structural evolution of STO leads to changes of the permittivity and THz transmission response for the GaN/annealed STO sensors. Compared with GaN-only or unannealed STO sensors, the proposed sensor shows temperature-dependent shifts on both resonance frequency and amplitude, leading to improved performance. Additionally, the GaN/1000 °C-annealed STO sensor achieved the highest sensitivity and modulation depth, which are 0.3 GHz/K and 23.01%, respectively. This work provides a new strategy for the development of THz temperature sensors with high-precision and high-sensitivity.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 4","pages":"374-383"},"PeriodicalIF":3.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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