IEEE Transactions on Terahertz Science and Technology最新文献_第10页

2-D Fixed-Frequency Terahertz Beam Steering With Microactuated Leaky-Wave Structure 采用微动漏波结构的二维固定频率太赫兹波束转向装置

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-28 DOI: 10.1109/TTHZ.2024.3420760

Naoki Tanaka;Yasuaki Monnai

{"title":"2-D Fixed-Frequency Terahertz Beam Steering With Microactuated Leaky-Wave Structure","authors":"Naoki Tanaka;Yasuaki Monnai","doi":"10.1109/TTHZ.2024.3420760","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3420760","url":null,"abstract":"As the demand for high-speed communications grows, terahertz waves emerge as a promising frontier for 6G and beyond, offering unprecedented bandwidths. However, their shorter wavelengths result in significantly higher diffraction losses compared to microwaves, necessitating innovative solutions for directional beam steering to counteract these losses. Conventional large-aperture phased arrays face challenges at terahertz frequencies due to the lack of practical phase shifters. To address this challenge, this study introduces a novel 2-D beam steering technique employing a microdisplacement controlled leaky-wave structure. By exploiting the dispersion relation of waves propagating between quasiparallel metal plates, we effectively manipulate the wave trajectory and launch angle via precise displacement and tilt of the plates. Our experimental demonstration achieves effective 2-D terahertz beam steering, eliminating the need for frequency sweeping. At 280 GHz, we achieve a steering range of \u0000<inline-formula><tex-math>${bf pm ! 37^{circ }}$</tex-math></inline-formula>\u0000 horizontally with a plate tilt of \u0000<inline-formula><tex-math>${bf pm 0.169^circ }$</tex-math></inline-formula>\u0000 and \u0000<inline-formula><tex-math>${bf 18^{circ }}$</tex-math></inline-formula>\u0000 vertically with a plate translation of 0.2 mm, along with a 3 dB frequency bandwidth of 9.7 GHz and a 10 dB bandwidth of 17.3 GHz. This method not only circumvents the limitations posed by the lack of phase shifters but also facilitates integration into compact, planar systems without expanding the physical profile. This result paves the way for directionally agile terahertz communications, enabling real-time user and device tracking capabilities.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"599-606"},"PeriodicalIF":3.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165006","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

Occlusion Removal in Terahertz Frequency-Modulated Continuous Wave Nondestructive Testing Based on Inpainting 基于涂色技术的太赫兹频率调制连续波无损检测中的遮挡去除技术

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-26 DOI: 10.1109/TTHZ.2024.3419435

Bin Liang;Tianyi Wang;Sishi Shen;Congjing Hao;Defeng Liu;Jinsong Liu;Kejia Wang;Zhengang Yang

{"title":"Occlusion Removal in Terahertz Frequency-Modulated Continuous Wave Nondestructive Testing Based on Inpainting","authors":"Bin Liang;Tianyi Wang;Sishi Shen;Congjing Hao;Defeng Liu;Jinsong Liu;Kejia Wang;Zhengang Yang","doi":"10.1109/TTHZ.2024.3419435","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3419435","url":null,"abstract":"Terahertz frequency-modulated continuous wave is an effective tool for nondestructive testing. Occlusion is one of the bottlenecks of current imaging techniques for the nondestructive testing of complex objects. In reflective imaging, surface objects can cause information occlusion of deep defects in the detection direction, thus decreasing the effectiveness of nondestructive testing. In this article, a method of occlusion removal is proposed by using the layered imaging capability of frequency-modulated continuous wave systems. A specific mask is generated from the image of the surface layer, which can cover the shading on the image of the layer behind it. After an isophote-driven, exemplar-based synthetic inpainting process, the effect of the occlusion can be eliminated and the images of each layer can be restored. It is important to note that deep objects cannot be completely occluded and the deep image should have enough feature information for successful restoration. To demonstrate this, we successfully restored the occluded images from overlapping multilayer samples and validated the method in real scenes. The quantitative computational results show that the proposed method can effectively remove the occlusion and restore the images of each layer. The method provides a practical solution to the problem of occlusion that arises in the application field of nondestructive testing for any objects with multiple layers.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"699-707"},"PeriodicalIF":3.9,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160055","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 Components by Additive Manufacturing: Material and Fabrication Characterizations Realized Through Bragg Structures 通过增材制造实现太赫兹组件：通过布拉格结构实现材料和制造特性分析

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-26 DOI: 10.1109/TTHZ.2024.3419080

C. Harrison Brodie;Isaac Spotts;Christopher M. Collier

{"title":"Terahertz Components by Additive Manufacturing: Material and Fabrication Characterizations Realized Through Bragg Structures","authors":"C. Harrison Brodie;Isaac Spotts;Christopher M. Collier","doi":"10.1109/TTHZ.2024.3419080","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3419080","url":null,"abstract":"This work explores Bragg structures and superstructures for the terahertz regime that are 3-D printed with two filament materials, i.e., high-impact polystyrene (HIPS) and cyclic olefin copolymer (COC). We show underlying frequency responses that come about due to the material absorption and chosen 3-D printing resolution. A terahertz time-domain spectroscopy analysis shows the favorable low absorption coefficient of COC filament material compared to that of HIPS filament material. Through a demonstration of terahertz Bragg superstructures for both HIPS and COC filament material, we show the contrast in performance and mitigation of undesired absorption for a terahertz photonic element made from COC filament material. The experimental results show agreement with a finite-difference time-domain simulation of the terahertz Bragg superstructures. Through a demonstration of terahertz Bragg structures for both HIPS and COC filament material, we show the effect of printing resolution (over 50–400 μm range) of the terahertz spectral response. Terahertz Bragg structures and superstructures made from COC filament material show great promise for rapid prototyping of terahertz photonic elements.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"745-757"},"PeriodicalIF":3.9,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142159828","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

Impact of Snowfall on Terahertz Channel Performance: Measurement and Modeling Insights 降雪对太赫兹通道性能的影响：测量和建模启示

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-21 DOI: 10.1109/TTHZ.2024.3417319

Guohao Liu;Xiangkun He;Jiabiao Zhao;Da Li;Hong Liang;Houjun Sun;Daniel M. Mittleman;Jianjun Ma

{"title":"Impact of Snowfall on Terahertz Channel Performance: Measurement and Modeling Insights","authors":"Guohao Liu;Xiangkun He;Jiabiao Zhao;Da Li;Hong Liang;Houjun Sun;Daniel M. Mittleman;Jianjun Ma","doi":"10.1109/TTHZ.2024.3417319","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3417319","url":null,"abstract":"In the evolving domain of wireless communication, the investigation of the terahertz (THz) frequency spectrum, spanning 0.1–10 THz, has become a critical focus for advancing ultra-high-speed data transmission technologies. The effective deployment of THz wireless communication techniques mandates a complete study of channel performance under various atmospheric conditions, such as rain, fog, cloud, haze, and, notably snow. These environmental elements significantly impact the design of the protocol stack, ranging from physical-layer signal processing to application design and strategic network planning. An in-depth understanding of channel propagation and fading characteristics in real-world environments, especially over ultrawide bandwidths, is crucial. This work presents a comprehensive measurement-based and theoretical investigation of Line-of-Sight (LoS) THz channel performance in snowy conditions. It methodically examines both the empirical and predicted aspects of channel power and bit-error-ratio (BER). The effects of snowfall rate, carrier frequency, ambient temperature, and relative humidity on channel performance are analyzed and discussed. Our findings demonstrate that snowy conditions not only exert power loss but also induce rapid fluctuations in the power levels of the THz channel. Notably, our results reveal an absence of significant multipath effects in these scenarios. This insight highlights the need for further research into the dynamics of snowflake movement and their interaction with THz transmission paths.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"691-698"},"PeriodicalIF":3.9,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142159804","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

Leveraging the Nonlinearity of THz Photomultiplier Tubes for Enhanced Spectroscopic Sensitivity 利用太赫兹光电倍增管的非线性增强光谱灵敏度

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-21 DOI: 10.1109/TTHZ.2024.3417346

Tobias Olaf Buchmann;Yuma Takida;Matej Sebek;Naoya Kawai;Ginji Sugiura;Hiroaki Minamide;Peter Uhd Jepsen;Simon Jappe Lange

引用次数: 0

Terahertz Extreme Skin-Depth Waveguides 太赫兹极肤深波导

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-21 DOI: 10.1109/TTHZ.2024.3417234

Harrison Lees;Daniel Headland;Withawat Withayachumnankul

{"title":"Terahertz Extreme Skin-Depth Waveguides","authors":"Harrison Lees;Daniel Headland;Withawat Withayachumnankul","doi":"10.1109/TTHZ.2024.3417234","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3417234","url":null,"abstract":"All-silicon substrateless waveguides have become a leading contender for terahertz device integration owing to their broad operating bandwidth and exceptional efficiency. However, without metallic confinement, these unshielded waveguides are susceptible to evanescent coupling, requiring that waveguides be placed sparsely to resist unwanted interactions. This sparsity remains a critical obstacle to compact devices and integrated systems. To counter this, we demonstrate substrateless extreme skin-depth waveguides, utilizing a self-supporting anisotropic cladding that markedly reduces the evanescent field penetration into the surrounding cladding, and hence, suppresses cross coupling between waveguides. Here, we achieve 20-dB cross-talk suppression across the WR3.4 band, 220–330 GHz, a 40% fractional bandwidth, with less than 0.5 free-space wavelength separations and coupling lengths exceeding ten free-space wavelengths. In addition, we exploit the low bending loss of this waveguide to realize an efficient and simply designable power divider to realize arbitrary extinction ratios between 1:1 and 10:1. Integrable with existing all-silicon devices, we foresee these techniques enabling the dense integration of terahertz systems with substrateless silicon waveguides.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"758-767"},"PeriodicalIF":3.9,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142159953","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 Quantum-Cascade Lasers: From Design to Applications 太赫兹量子级联激光器：从设计到应用

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-17 DOI: 10.1109/TTHZ.2024.3415501

Xiang Lü;Benjamin Röben;Valentino Pistore;Klaus Biermann;Esperanza Luna;Martin Wienold;Heinz-Wilhelm Hübers;Jente R. Wubs;Jean-Pierre H. van Helden;Pierre Gellie;Lutz Schrottke

{"title":"Terahertz Quantum-Cascade Lasers: From Design to Applications","authors":"Xiang Lü;Benjamin Röben;Valentino Pistore;Klaus Biermann;Esperanza Luna;Martin Wienold;Heinz-Wilhelm Hübers;Jente R. Wubs;Jean-Pierre H. van Helden;Pierre Gellie;Lutz Schrottke","doi":"10.1109/TTHZ.2024.3415501","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3415501","url":null,"abstract":"We report on the development and the application of high-performance terahertz (THz) quantum-cascade lasers (QCLs) based on GaAs/Al\u0000<inline-formula><tex-math>$_{x}$</tex-math></inline-formula>\u0000Ga\u0000<inline-formula><tex-math>$_{1-x}$</tex-math></inline-formula>\u0000As heterostructures. These lasers with emission frequencies between 2.6 and 4.7 THz are based on a hybrid design, which is preferred for continuous-wave applications. For the design of the active regions, we employ an efficient Fourier-transform-based model, which also allows for the simulation of heterostructures with gradual interfaces. Since the inherent interface width is on the same order as the thickness of the layers in the active region, the use of nominally binary AlAs barriers results in an effective Al content up to \u0000<inline-formula><tex-math>$x$</tex-math></inline-formula>\u0000 \u0000<inline-formula><tex-math>$=$</tex-math></inline-formula>\u0000 0.6 for the tallest barriers. For practical applications, Fabry–Pérot lasers based on single-plasmon waveguides are fabricated. Single-mode operation is in most cases achieved by using short cavities. In particular, GaAs/AlAs THz QCLs show a sufficiently high wall plug efficiency so that they can be operated in miniature mechanical cryocoolers. Currently, high-performance THz QCLs are used for commercial continuous-wave, table-top THz systems, local oscillators in 3.5- and 4.7-THz heterodyne spectrometers, and absorption spectrometers for the determination of the density of atomic oxygen in plasmas.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"579-591"},"PeriodicalIF":3.9,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10559383","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165097","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

THz Communications and the Demonstration in the ThoR–Backhaul Link 太赫兹通信和 ThoR 回程链路演示

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-17 DOI: 10.1109/TTHZ.2024.3415480

Thomas Kürner;Ralf-Peter Braun;Guillaume Ducournau;Uwe Hellrung;Akihiko Hirata;Shintaro Hisatake;Laurenz John;Bo Kum Jung;Ingmar Kallfass;Tetsuya Kawanishi;Keitarou Kondou;Yigal Leiba;Bruce Napier;Ran Timar;Alexandre Renau;Peter Schlegel;Pascal Szriftgiser;Axel Tessmann;Dominik Wrana

引用次数: 0

Detecting Genetic Variation in Plants by Mapping Cell Water Dynamics With Terahertz Laser Feedback Interferometry 利用太赫兹激光反馈干涉仪绘制细胞水动力学图，检测植物的遗传变异

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-11 DOI: 10.1109/TTHZ.2024.3412826

Urbi Kundu;Jari Torniainen;Karl Bertling;Mayuri Kashyap;Bogdan C. Donose;Tim Gillespie;Dragan Indjin;Lianhe Li;Edmund H. Linfield;Alexander Giles Davies;Paul Dean;Aparajita Bandyopadhyay;Amartya Sengupta;Aleksandar D. Rakić

{"title":"Detecting Genetic Variation in Plants by Mapping Cell Water Dynamics With Terahertz Laser Feedback Interferometry","authors":"Urbi Kundu;Jari Torniainen;Karl Bertling;Mayuri Kashyap;Bogdan C. Donose;Tim Gillespie;Dragan Indjin;Lianhe Li;Edmund H. Linfield;Alexander Giles Davies;Paul Dean;Aparajita Bandyopadhyay;Amartya Sengupta;Aleksandar D. Rakić","doi":"10.1109/TTHZ.2024.3412826","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3412826","url":null,"abstract":"This study investigated the use of terahertz (THz) imaging as a rapid, high-fidelity technique for discriminating between genetic variants of the \u0000<italic>Allium</i>\u0000 genus based on cellular water dynamics. It has been demonstrated earlier that plant genetic variations can be related to the biochemical and biomechanical alterations of the cell and that in turn affect the water dynamics within the cell. In this article, we show that the water dynamics, when considered in the form of the temporal evolution of the trajectory of the plant's response to THz radiation probe, and measured by a coherent THz transceiver, provides unique signature of the genetic makeup of the plant. Therefore, by exploring these trajectories, we discriminate between closely related variants of the same genus. The technique used for THz probing was the laser feedback interferometry with THz quantum cascade lasers, which enabled fast acquisition of high-resolution THz amplitude and phase images, which were processed into evaporation profiles describing the time-dependent dehydration of the samples. The trajectory of this profile in amplitude–phase reflectivity domain discriminates between different members of the \u0000<italic>Allium</i>\u0000 genus. This enables real-time genetic discrimination in agricultural and genome conservation applications.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"665-674"},"PeriodicalIF":3.9,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10553260","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160071","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

Terahertz Imaging Super-Resolution for Documental Heritage Diagnostics 用于文献遗产诊断的太赫兹成像超分辨率

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-06 DOI: 10.1109/TTHZ.2024.3410674

Danae Antunez Vazquez;Laura Pilozzi;Eugenio DelRe;Claudio Conti;Mauro Missori

引用次数: 0