IEEE Transactions on Terahertz Science and Technology最新文献

{"title":"Ultrabroadband Gain-Switched and Superluminescent Terahertz Semiconductor Lasers","authors":"Urban Senica;Michael A. Schreiber;Mattias Beck;Christian Jirauschek;Jérôme Faist;Giacomo Scalari","doi":"10.1109/TTHZ.2026.3723572","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3723572","url":null,"abstract":"Terahertz quantum cascade lasers (THz QCLs) are chip-scale semiconductor lasers operating in the frequency range between 1 and 6 THz, useful as compact sources for spectroscopy, communications, and nondestructive imaging and testing. Here, we apply low-frequency microwave modulation on a planarized THz QCL to generate ultrabroadband emission in the THz range. For very low modulation frequencies below 1 GHz, a gain-switched octave-spanning spectrum with a smooth spectral envelope is generated between 1.9 and 4.1 THz. Increasing the modulation frequency broadens the lasing modes until a low-coherence, continuous emission spectrum is achieved in the superluminescent regime, covering the spectral region between around 3 and 4 THz, without any discrete lasing modes or spectral gaps. We complement the experimental results with extensive analytical models and numerical simulations that capture the intracavity laser dynamics and fully explain the different operation regimes. These devices could prove useful for absorption spectroscopy without any spectral gaps, and as ultrabroadband sources of THz radiation.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 10","pages":"1168-1176"},"PeriodicalIF":3.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188454","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}

{"title":"IEEE Microwave Theory and Technology Society Information","authors":"","doi":"10.1109/TTHZ.2026.3737677","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3737677","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 10","pages":"C2-C2"},"PeriodicalIF":3.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11739414","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188537","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}

{"title":"Create Change","authors":"","doi":"10.1109/TTHZ.2026.3743395","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3743395","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 10","pages":"1199-1199"},"PeriodicalIF":3.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11739412","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188209","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}

{"title":"IEEE Transactions on Terahertz Science and Technology Publication Information","authors":"","doi":"10.1109/TTHZ.2026.3737681","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3737681","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 10","pages":"C3-C3"},"PeriodicalIF":3.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11739415","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188215","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}

{"title":"Terahertz Dielectric Phased-Array Antennas Based on Effective-Medium Platform for Wireless Communications","authors":"Weijie Gao;Nguyen Hoai Ngo;Daiki Ichikawa;Yuta Inose;Hidemasa Yamane;Yoshiharu Yamada;Shuichi Murakami;Masayuki Fujita","doi":"10.1109/TTHZ.2026.3723068","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3723068","url":null,"abstract":"The terahertz frequency band offers unprecedented bandwidths for next-generation wireless communications, but suffers from significant free-space path loss that necessitates highly directive antennas. Beam-steering antennas are therefore essential to dynamically align high-gain beams and maintain link reliability in practical terahertz wireless systems. In this work, we propose a phased-array antenna based on an all-silicon effective-medium waveguide platform. The proposed architecture integrates a feeding network, terahertz phase shifters, and a dense waveguide array terminated by dielectric rod antennas, with each component realized in a modular hollow waveguide package. Compared with conventional terahertz phased arrays that achieve phase control in either the electronic or photonic domain, the proposed design enables direct phase tuning in the terahertz domain using widely accessible phase shifters, while maintaining low loss, broad bandwidth, and scalability. As a proof of concept, a two-element phased array is demonstrated, achieving continuous beam steering over <inline-formula><tex-math>$pm 20^{circ }$</tex-math></inline-formula> at the 300-GHz band. The impact of interwaveguide coupling and radiator mutual interaction is systematically investigated. Wireless communications experiments further validate the beam-steering functionality, supporting transmission data rates up to 40 Gbit/s with 16-QAM modulation and real-time high-definition video transmission. The proposed design demonstrates the feasibility of all-dielectric waveguide platforms for dynamic beam-steerable antennas and lays the foundation for efficient fully integrated terahertz phased arrays for 6G and beyond.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 10","pages":"1138-1154"},"PeriodicalIF":3.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11652993","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188507","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}

{"title":"IEEE Transactions on Terahertz Science and Technology Information for Authors","authors":"","doi":"10.1109/TTHZ.2026.3737679","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3737679","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 10","pages":"1197-1198"},"PeriodicalIF":3.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11739413","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188442","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}

{"title":"Intense Terahertz Time Domain Spectroscopy of Water-Based Liquid Crystals","authors":"Fabio Novelli;Lorenza Spina;Andrea Rubano;Laura Cattaneo;Domenico Paparo;Federica Ciuchi;Maria Penelope De Santo","doi":"10.1109/TTHZ.2026.3690056","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3690056","url":null,"abstract":"Intense terahertz time-domain spectroscopy (THz-TDS) enables the characterization of highly absorbing and optically thick media by combining bright THz sources with off-focus probing conditions that suppress nonlinearities. In this article, we apply it to cromolyn sodium salts dissolved in pure water, across the isotropic and nematic phases. Transmission measurements performed on half-millimeter thick liquid samples kept at 20 °C and 40 °C reveal systematic reductions in the THz absorption when compared to pure water, which is consistent with effective-medium predictions for isotropic solutions. A distinct excess absorption, however, emerges exclusively for the nematic phase, indicating a novel spectroscopic signature of supramolecular ordering. Polarized optical microscopy confirms the presence of domains with sizes comparable to the THz wavelengths used, suggesting that scattering could contribute to the anomalous THz response recorded in the nematic phase. Our results demonstrate that intense THz-TDS provides a noncontact probe of mesophase formation in lyotropic chromonics without the need to apply external bias. In turn, this offers a route to studying opaque systems wherein the microstructural organization lacks the strong optical signatures of liquid crystals.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 10","pages":"1067-1074"},"PeriodicalIF":3.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188716","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}

{"title":"A 334-GHz 1024-Pixel Real-Time Terahertz Near-Field Imager for Quantitative Permittivity Mapping","authors":"Hamadi Sadkaoui;Philipp Hillger;Xinpeng Du;Marcel Andree;Connor D. W. Mosley;Adam G. Metcalf;Thomas Gill;Cleopatra Charalampaki;Pietro Valdastri;John E. Cunningham;Ullrich R. Pfeiffer","doi":"10.1109/TTHZ.2026.3726676","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3726676","url":null,"abstract":"This work presents the modeling, calibration, and experimental validation of a <inline-formula><tex-math>$text{334},text{GHz}$</tex-math></inline-formula> real-time near-field imaging system implemented in 130-nm silicon–germanium bipolar complementary metal-oxide-semiconductor (BiCMOS) technology. The sensor comprises 1024 pixels arranged in a <inline-formula><tex-math>$text{32}times text{32}$</tex-math></inline-formula> matrix, where each pixel integrates an radio frequency (RF) oscillator for terahertz illumination, a split-ring resonator sensing element enabling localized interaction with the material under test (MUT), and a power detector for RF-to-DC conversion. The architecture achieves a pixel density of 200 pixels/mm<inline-formula><tex-math>$^{2}$</tex-math></inline-formula> through compact vertical integration of the sensing elements within the back-end-of-line stack. An analytical model is developed to relate the digital sensor output to the dielectric properties and geometric configuration of the MUT. The analysis shows that the single-pixel response follows a permittivity-dependent exponential distance decay, while interpixel coupling remains sufficiently low (<inline-formula><tex-math>$&lt; -37,text{dB}$</tex-math></inline-formula>) to preserve pixel fidelity in the dense array. The influence of temperature on the sensing chain is experimentally investigated, and a temperature-dependent calibration procedure is introduced to compensate for thermal drift. Sensitivity is evaluated using calibrated liquid samples with controlled permittivity. The system sensitivity is quantified using a newly introduced noise-equivalent real-permittivity change <inline-formula><tex-math>$text{NE}Delta epsilon _{text{re}}$</tex-math></inline-formula>, which is defined as the propagated uncertainty of the estimated real permittivity and serves as the adopted sensitivity metric. The proposed sensor achieves <inline-formula><tex-math>$text{NE}Delta epsilon _{text{re}}$</tex-math></inline-formula> values ranging from 0.09 to 0.19 across the investigated calibration conditions. An overall permittivity estimation accuracy of 0.11 is obtained relative to reference measurements. Finally, near-field imaging of coagulated chicken breast tissue and dielectric phantoms demonstrates the capability of the proposed sensor for quantitative dielectric characterization and biomedical imaging applications.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 10","pages":"1155-1167"},"PeriodicalIF":3.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188153","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}

{"title":"Manipulating Terahertz Waves Using Light for Tunable and Reconfigurable Terahertz Devices","authors":"Lei Liu;Patrick Fay;Li-Jing Cheng;Cheuk-Yu E. Tong;Jeffrey L. Hesler;Robert M. Weikle;Hualiang Zhang;Chao Gu","doi":"10.1109/TTHZ.2026.3693625","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3693625","url":null,"abstract":"Tunable and reconfigurable devices for efficiently manipulating terahertz (THz) waves in advanced sensing, imaging, and communication are challenging to realize. An especially promising approach for developing this class of THz devices—based on spatially-resolved photoconductivity modulation (SRPM) in semiconductors—will be introduced, followed by prototype demonstrations. The SRPM concept can be further enhanced by using mesa-array structures to achieve higher modulation depth and improved spatial resolution for more advanced tunable and reconfigurable THz devices. High-performance THz optically-controlled switches enabling next-generation adaptive integrated THz circuits/systems will then be discussed, and their use for achieving reconfigurable THz filters will also be presented. Finally, in addition to amplitude modulation, a unique approach for achieving high-performance THz phase shifting will be described. In total, the SRPM concept provides a critical solution that enables complete, systematic, and versatile technology for manipulating THz waves across a wide range of applications.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 10","pages":"1104-1123"},"PeriodicalIF":3.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188625","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}

{"title":"Impact of Rain Scattering on Spatial Isolation in Terahertz Space-Division Multiplexing","authors":"Tetsuya Kawanishi;Bo Kum Jung;Arata Ogaki;Manato Yamada;Kota Nagasawa;Kanna Onda;Kunihisa Jitsuno;Keizo Inagaki;Masataka Sugiyama;Shintaro Hisatake;Yusuke Tanaka;Thomas Kürner","doi":"10.1109/TTHZ.2026.3729440","DOIUrl":"https://doi.org/10.1109/TTHZ.2026.3729440","url":null,"abstract":"Terahertz (THz) space-division multiplexing (SDM) using highly directional beams is a promising approach for high-capacity fixed wireless backhaul and fronthaul, but its spatial isolation can be significantly affected by weather-induced impairments under outdoor conditions. This article investigates rain-induced crosstalk in space-division-multiplexed THz fixed wireless systems from a design-oriented perspective. Controlled rainfall measurements were performed at 300 GHz using receiver angular scanning under both aligned and intentionally beam-offset transmitter configurations in the far field. The measurement results show that rainfall generates off-axis scattered components that couple energy into adjacent spatial channels, in addition to conventional rain attenuation and wind-induced effective gain degradation. This scattering-induced coupling establishes a weather-dependent limitation on achievable spatial isolation that cannot be mitigated simply by increasing transmit power, making it a critical factor for robust link design in SDM systems.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"16 10","pages":"1177-1196"},"PeriodicalIF":3.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11673282","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188368","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}