IEEE Transactions on Terahertz Science and Technology最新文献_第6页

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\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\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

Multifrequency Digital Terahertz Holography Within 1.39–4.25 THz Range 1.39-4.25 太赫兹范围内的多频数字太赫兹全息技术

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.2024.3410670

Rusnė Ivaškevičiūtė-Povilauskienė;Ignas Grigelionis;Agnieszka Siemion;Domas Jokubauskis;Kęstutis Ikamas;Alvydas Lisauskas;Linas Minkevičius;Gintaras Valušis

引用次数: 0

Structural Investigation of Cocrystal Formed Between Theophylline and Nicotinamide Based on Terahertz and Raman Spectroscopy 基于太赫兹和拉曼光谱的茶碱与烟酰胺共晶体结构研究

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.2024.3410680

Binyi Qin;Jie Qiu;Ruizhao Yang;Yongjin Gan;Hesen Zhong;Qitao Liao;Shaolin Lu;Yun Li

{"title":"Structural Investigation of Cocrystal Formed Between Theophylline and Nicotinamide Based on Terahertz and Raman Spectroscopy","authors":"Binyi Qin;Jie Qiu;Ruizhao Yang;Yongjin Gan;Hesen Zhong;Qitao Liao;Shaolin Lu;Yun Li","doi":"10.1109/TTHZ.2024.3410680","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3410680","url":null,"abstract":"Pharmaceutical cocrystals present a promising avenue for enhancing the physicochemical properties of active pharmaceutical ingredients by modifying intermolecular interactions among raw materials. Theophylline, a methylpurine drug commonly used in respiratory treatments, has limited bioavailability in vivo due to its poor water solubility. In this study, a theophylline–nicotinamide cocrystal was successfully synthesized using the solid-state grinding method. Both the parent materials and the theophylline–nicotinamide cocrystal were characterized using terahertz and Raman spectroscopy. The terahertz spectra exhibited significant differences in the absorption peak between the experimental cocrystal and the parent materials, which were further corroborated by similar findings in the Raman spectra. In addition, density functional theory was employed to optimize the structure of the theophylline–nicotinamide cocrystal and identify its corresponding vibrational modes. Furthermore, intermolecular interactions were analyzed through the independent gradient model based on Hirshfeld partition analysis and Hirshfeld surface analysis. The results demonstrate that the integration of terahertz and Raman spectroscopy with theoretical calculations provides valuable insights into the molecular-level formation of cocrystals. This approach offers crucial information for the analysis of weak interactions in pharmaceutical cocrystals, which is essential for their design and optimization.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 4","pages":"476-483"},"PeriodicalIF":3.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495191","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

Topology-Optimized Metal Structure for Broadband Wavefront Engineering of Guided Terahertz Waves 拓扑优化金属结构用于太赫兹导波宽带波前工程

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-04-26 DOI: 10.1109/TTHZ.2024.3394295

Shinya Nishijima;Yasuaki Monnai

引用次数: 0

Design, Simulation, and Characterization of a Partial Negative Curvature Antiresonant Hollow-Core Fiber for Low Loss Terahertz Wave Transmission 用于低损耗太赫兹波传输的部分负曲率反谐振中空芯光纤的设计、仿真和特性分析

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-04-25 DOI: 10.1109/TTHZ.2024.3393609

Qiyuan Mu;Yuanfeng Zhu;Depeng Kong;Zhengquan He;Hongjun Liu;Lili Wang

{"title":"Design, Simulation, and Characterization of a Partial Negative Curvature Antiresonant Hollow-Core Fiber for Low Loss Terahertz Wave Transmission","authors":"Qiyuan Mu;Yuanfeng Zhu;Depeng Kong;Zhengquan He;Hongjun Liu;Lili Wang","doi":"10.1109/TTHZ.2024.3393609","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3393609","url":null,"abstract":"This article demonstrates a novel partial negative curvature hollow-core fiber for low-loss terahertz transmission. In the optimized fiber structure, the tubes in the vertical direction are replaced by plate-like dielectric sheets, thereby achieving low loss and low blocked risk of 3D printing, while retaining a small fiber hollow core and fiber diameter. The 3D printed fiber is characterized by a terahertz time-domain spectroscopy system. The obtained transmission spectrum demonstrates the mode beating phenomenon and its peak position varies periodically with fiber length at short distances. The thin antiresonant walls endow the fiber with two broad low-loss windows of 0.2–0.4 THz and 0.55–0.85 THz. Besides, the \u0000<italic>x\u0000-polarization and \u0000<italic>y\u0000-polarization waves achieve minimum losses of 16.2 dB/m@0.28 THz and 16.0 dB/m@0.29 THz, respectively. Furthermore, our fiber has low experimental dispersions, namely −0.18±1.1 ps/THz/cm (\u0000<italic>x\u0000-pol) and 0.67 ± 0.77 ps/THz/cm (\u0000<italic>y\u0000-pol). The experimental losses and dispersions match well with the simulation results. Additionally, the simulation results reveal that the fiber has the potential to attain a high birefringence of 10\u0000−3\u0000.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 4","pages":"510-518"},"PeriodicalIF":3.9,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495308","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