IEEE Transactions on Terahertz Science and Technology最新文献_第2页

Broadband High-Harmonic Multiplying Gyro-TWT in Terahertz Regime 太赫兹波段宽带高谐波倍增陀螺行波管

IF 3.6 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-07-01 Epub Date: 2026-03-11 DOI: 10.1109/TTHZ.2026.3691932

Chao-Hai Du;Feng Zhang;Jia-Ji Feng;Xin-Yin Cao;Ji-Tao Yang

{"title":"Broadband High-Harmonic Multiplying Gyro-TWT in Terahertz Regime","authors":"Chao-Hai Du;Feng Zhang;Jia-Ji Feng;Xin-Yin Cao;Ji-Tao Yang","doi":"10.1109/TTHZ.2026.3691932","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3691932","url":null,"abstract":"Harmonic multiplying provides a key solution to addressing the shortage of high-frequency driving sources and the strong magnetic field requirements for gyro-TWTs in terahertz band. In this article, broadband harmonic multiplying gyro-TWTs are proposed and theoretically investigated, which enable the use of commercially available G-band solid-state sources as the driver and extends the gyro-TWT operation into unprecedented terahertz regime. The composite interaction circuit with different radii separated by a long drift section is proposed, and the associated nonlinear beam dynamics are analyzed in detail to guide the optimization. Distributed losses and the axis-encircling electron beam are employed to ensure the stable harmonic operation. A magnetic cusp gun with a velocity spread below 1.2% is developed and the cathode thermal profile is characterized, demonstrating the feasibility of the proposed interaction scheme. Finally, numerical simulations demonstrate that stable third and fourth harmonic multiplying are achieved at 80 kV voltage and 1 A current, with 3-dB bandwidths of 10 GHz and 11 GHz around 660 GHz and 865 GHz, corresponding to high efficiencies of 7.68% and 2.61%, respectively. This article demonstrates a practical and realizable route toward broadband, high-power terahertz amplifiers, paving the way for significant advances in terahertz radar and spectroscopic applications.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 7","pages":"793-800"},"PeriodicalIF":3.6,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442497","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

Experimental Characterization and Dynamic Modeling of THz Channels Under Fog Conditions 雾条件下太赫兹通道的实验表征与动态建模

IF 3.6 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-07-01 Epub Date: 2026-03-15 DOI: 10.1109/TTHZ.2026.3693840

Jiabiao Zhao;Kefeng Huang;Xiaoxiang Li;Mingxia Zhang;Peian Li;Wenbo Liu;Jie Yang;Yiming Zhao;Weidong Hu;Jianjun Ma

{"title":"Experimental Characterization and Dynamic Modeling of THz Channels Under Fog Conditions","authors":"Jiabiao Zhao;Kefeng Huang;Xiaoxiang Li;Mingxia Zhang;Peian Li;Wenbo Liu;Jie Yang;Yiming Zhao;Weidong Hu;Jianjun Ma","doi":"10.1109/TTHZ.2026.3693840","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3693840","url":null,"abstract":"The terahertz (THz) band is a promising candidate for sixth-generation wireless networks, but its deployment in outdoor environments is challenged by meteorological phenomena, particularly fog, which imposes variable and difficult-to-predict channel degradation. This article introduces a dynamic channel model for the THz band explicitly driven by the time-evolving droplet size distribution (DSD) of fog, integrating real-time microphysical sensing to capture variations in the fog microstructure. The model is validated for quasi stationary fog conditions, subject to the operating limits of the microphysical sensor. Experimental measurements were conducted at 220 and 320 GHz in a controlled fog chamber to achieve quasi-stationary states, and a larger room-scale setup to characterize dynamic, nonstationary fog evolution. The results confirm that channel power loss is overwhelmingly dominated by absorption rather than scattering, validating the use of the lower computational complexity Rayleigh approximation below 1 THz. Statistical analysis revealed exceptionally high Rician K-factors, demonstrating that THz channels maintain strong line-of-sight stability even in dense fog. System-level performance analysis shows that degradation in bit error rate is driven by the slow, gradual evolution of the DSD, rather than fast multipath fading. This finding enables the reliable simplification of the THz fog channel into a near-Gaussian channel model with time-varying signal-to-noise ratio. This microphysics-aware approach established here provides the necessary foundation for developing adaptive system designs centered on channel power tracking for robust future THz networks.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 7","pages":"757-767"},"PeriodicalIF":3.6,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442859","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

Optically Controlled Terahertz-Wave Modulator on Substrateless Silicon Waveguide 无衬底硅波导上的光控太赫兹波调制器

IF 3.6 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-07-01 Epub Date: 2026-04-20 DOI: 10.1109/TTHZ.2026.3685981

Chung Yin Tam;Panisa Dechwechprasit;Rajour Tanyi Ako;Madhu Bhaskaran;Andreas Boes;Ke Wang;Christophe Fumeaux;Withawat Withayachumnankul

{"title":"Optically Controlled Terahertz-Wave Modulator on Substrateless Silicon Waveguide","authors":"Chung Yin Tam;Panisa Dechwechprasit;Rajour Tanyi Ako;Madhu Bhaskaran;Andreas Boes;Ke Wang;Christophe Fumeaux;Withawat Withayachumnankul","doi":"10.1109/TTHZ.2026.3685981","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3685981","url":null,"abstract":"A terahertz-wave modulator is a crucial component in achieving high-speed wireless communications and advanced terahertz signal processing. Most previously realized terahertz modulators have primarily focused on wave manipulation in free space, which hardly fulfills the requirements for system-level compactness and miniaturization. This article introduces an optically controlled terahertz modulator on a substrateless silicon platform. This modulator incorporates a dipole resonator and a 1-D photonic crystal cavity to enhance the sensitivity of the terahertz waveguide to optical stimulus, achieving an enhanced modulation depth with a limited optical excitation power. This enabled us to demonstrate a modulation depth of 15.52 dB for the terahertz signal at 275.22 GHz with an optical power of 6.8 mW. While the modulation speed is 74 kHz in this work, which is limited by silicon’s long carrier lifetime, and we anticipate that the modulation frequency can reach gigahertz levels by incorporating a semiconductor with a faster recombination time. The proposed modulator topology holds substantial promise for integration into terahertz systems for wireless communications, where miniaturization, efficiency, and rapid modulation are essential.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 7","pages":"836-844"},"PeriodicalIF":3.6,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442682","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

Concurrent Terahertz Image Differentiation and Integration Processing via Polarization-Multiplexed Metasurface 基于偏振多路元表面的并发太赫兹图像分化与集成处理

IF 3.6 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-07-01 Epub Date: 2026-04-06 DOI: 10.1109/TTHZ.2026.3681077

Linyun Luo;Qingyang Liu;Linkun Wei;Yuan Zhao;Limei Qi

{"title":"Concurrent Terahertz Image Differentiation and Integration Processing via Polarization-Multiplexed Metasurface","authors":"Linyun Luo;Qingyang Liu;Linkun Wei;Yuan Zhao;Limei Qi","doi":"10.1109/TTHZ.2026.3681077","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3681077","url":null,"abstract":"The terahertz (THz) band, often regarded as the final frontier of the electromagnetic spectrum, remains largely unexploited despite its immense potential for scientific and industrial breakthroughs. Consequently, the advancement of THz-related technologies is of paramount importance, with THz image processing emerging as a critical domain for future applications. Although THz analog image processing offers remarkable advantages over digital methods, including inherent spatial parallelism and low power consumption, existing paradigms have historically lacked effective functional concurrency—a capability fundamental to sophisticated information processing. To bridge this gap, this article proposes a THz image processor based on a polarization-multiplexed metasurface capable of performing differentiation and integration concurrently. Polarization encoding enables the processor to effectively integrate two optical transfer functions corresponding to differentiation and integration into a single-layer metasurface. Experimental results demonstrate successful differentiation and integration operations on THz images, achieving edge enhancement and denoising concurrently. This architecture paves the way for multifunctional, high-speed THz image processing technologies, holding the potential to accelerate data handling and preprocess data for digital neural network algorithms.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 7","pages":"777-785"},"PeriodicalIF":3.6,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442952","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

Characterization and Interference Mitigation of a 170–200 GHz 2 × 2 MIMO System 170-200 GHz 2 × 2 MIMO系统的特性与干扰抑制

IF 3.6 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-07-01 Epub Date: 2026-03-19 DOI: 10.1109/TTHZ.2026.3694208

Tao Wu;Xiao-Sheng Ni;Changjie Hu;Zebin Huang;Weichao Li;Xiongbin Yu;Xiaofeng Tao

引用次数: 0

Terahertz Optical Switches With Movable Silicon Waveguides Monolithically Fabricated on High-Resistivity Single-Crystal Silicon Substrates 在高电阻率单晶硅衬底上单片制造可移动硅波导的太赫兹光开关

IF 3.6 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2026-07-01 Epub Date: 2026-04-16 DOI: 10.1109/TTHZ.2026.3683533

Kohei Chiba;Yoshiaki Kanamori

{"title":"Terahertz Optical Switches With Movable Silicon Waveguides Monolithically Fabricated on High-Resistivity Single-Crystal Silicon Substrates","authors":"Kohei Chiba;Yoshiaki Kanamori","doi":"10.1109/TTHZ.2026.3683533","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3683533","url":null,"abstract":"Photonic integrated circuits (PICs) based on dielectric waveguides are being developed for beyond 5G/6G communication systems. Variable passive elements, essential for PICs, present challenges for downsizing and low power consumption in the terahertz range. Variable passive elements based on microelectromechanical systems (MEMS) are promising solutions; however, the previous terahertz variable passive elements based on MEMS have complex structures processed on all layers of silicon-on-insulator (SOI) substrates. They can be fabricated on a single layer of silicon substrate, which is cheaper than an SOI substrate. However, to the best of the authors’ knowledge, there have been no demonstrations. We proposed a terahertz optical switch, which is one of the variable passive elements, based on comb-drive actuators fabricated on a single layer of silicon substrate. A comb-drive actuator was designed for 200 μm displacement at 104.5 V. An optical switch was designed for an extinction ratio of 18.9 dB at 300 GHz. The device was fabricated on a single layer of high-resistivity single-crystal silicon substrate, achieving a displacement of 185.4 μm at 93 V and an extinction ratio of 13.69 dB at 300 GHz. The optical switch part measured 5.65 mm long and power consumption was only 3.6 mW, outperforming previous works. While conventional comb-drive actuators are fabricated on SOI substrates, our design was fabricated on a single layer of silicon substrate. The proposed single-layer comb-drive actuator can be applied to variable phase shifters, directional couplers, and add/drop filters. This work addresses key challenges in terahertz variable passive elements and contributes to the advancement of terahertz PICs for beyond 5G/6G communications.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 7","pages":"801-812"},"PeriodicalIF":3.6,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11482691","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442838","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

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

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

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

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

引用次数: 0