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Phase-Controllable Spoof Surface Plasmon Coupling from Bull's Eye Aperture to Planar Silicon Waveguide in the Terahertz Band IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-04-22 Taiyu Okatani, Kaoru Imai, Yuma Takida, Seigo Ohno, Hiroaki Minamide, Yoshiaki Kanamori
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Up-and-Down Adjustment of the GaAs Loss Tangent Using Extreme Power Densities in a Subterahertz Cavity IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-04-18 Maxim L. Kulygin, E. A. Novikov, M. V. Kamensky, V. I. Belousov, I. A. Litovsky, A. P. Fokin, A. A. Ananichev, A. A. Orlovsky, V. V. Parshin, E. A. Serov, M. D. Proyavin, O. A. Malshakova, A. V. Afanasiev, A. A. Sorokin
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Modeling of antenna-coupled Si MOSFETs in the Terahertz Frequency Range IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-04-12 Florian Ludwig, Jakob Holstein, Anastasiya Krysl, Alvydas Lisauskas, Hartmut G. Roskos
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Mechanically Reconfigurable Polarization Converter for Terahertz Waves IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-04-11 Sakib Quader, Rajour Tanyi Ako, Sharath Sriram, Christophe Fumeaux, Withawat Withayachumnankul
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Spatial polarization modulation for terahertz single pixel imaging IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-04-11 Seth N. Lowry, James M. Flood, Glitta R. Cheeran, Matthew E. Reid, Christopher M. Collier
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Demonstration of Near Diffraction-Limited Terahertz Images using a CMOS-Integrated Chessboard Array IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-04-11 Martijn Hoogelander, Robbin van Dijk, Marco Spirito, Nuria Llombart, Maria Alonso-delPino
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Phase-Locking of Quantum-Cascade Lasers Operating Around 3.5 THz and 4.7 THz With a Schottky-Diode Harmonic Mixer IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-04-08 Heiko Richter, Nick Rothbart, Martin Wienold, Xiang Lü, Klaus Biermann, Lutz Schrottke, Divya Jayasankar, Jan Stake, Peter Sobis, Heinz-Wilhelm Hübers
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Modeling Analysis and Research of Terahertz Wave Propagation Experiment at Sea IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-03-20 Xiangchun Cao, Juan Liu, Jianhong Hao, Qiang Zhao, Bixi Xue, Fang Zhang, Jieqing Fan, Changxing Lin, Zhiwei Dong
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Beyond 500 GHz THz Wireless Links Based on Heterodyne Photo-mixing and Absolute Operation Pruned Two-Stage MIMO Volterra IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-03-18 Junting Shi, Yanyi Wang, Jiao Zhang, Xianmin Zhao, Min Zhu, Wen Zhou, Jianjun Yu
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Theoretical and experimental investigation on the effect of beam misalignment on a second harmonic 0.8 THz gyrotron IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-03-05 Xianfei Chen, Houxiu Xiao, Yu Huang, Runfeng Tang, Donghui Xia, Xiaotao Han
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IEEE Microwave Theory and Techniques Society Information IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-03-04
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IEEE Transactions on Terahertz Science and Technology Information for Authors IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-03-04
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TechRxiv: Share Your Preprint Research with the World! IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-03-04
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Editorial IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-03-04 Nuria Llombart, Frank Hegmann, Ho-Jin Song
Welcome to the second issue in Volume 14 of the IEEE Transactions on Terahertz Science and Technology (T-TST) with 15 original papers in a variety of topics of interest for the THz community. In this issue, we have an invited paper from the groups of Clara Saraceno and Sascha Preu. They present some exciting new results regarding the performance of photoconductive receivers at 1030 nm excited by high
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IEEE Transactions on Terahertz Science and Technology Publication Information IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-03-04
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A 100-300 GHz Attenuator-Based Ultra-Wideband Vector Modulator IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-02-29 Konstantin Kuliabin, Cristina Maurette-Blasini, Roger Lozar, Sébastien Chartier, Arnulf Leuther, Rüdiger Quay
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A 16 GHz Bandwidth Cryogenic IF Amplifier with 4-K Noise Temperature for Sub-mm Radio-Astronomy Receivers IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-02-27 Isaac López-Fernández, Juan D. Gallego, Carmen Diez, Inmaculada Malo-Gomez, Ricardo I. Amils, Ralf Flückiger, Diego Marti, Ronald Hesper
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Real-time Rapid-scanning Time-domain Terahertz Radiation Registration System with Single-digit Femtosecond Delay-axis Precision IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-02-22 Mingyuan Zhang, Jacob Byers, Brett N. Carnio, Abdulhakem Y. Elezzabi
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A Broadband Conversion Loss Measurement Technique for Terahertz Harmonic Mixers IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-02-22 Divya Jayasankar, Theodore Reck, Steven Durant, Jan Stake, Jeffrey Hesler
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Time-domain Equivalent Circuits for the Link Modelling Between Pulsed Photoconductive Sources and Receivers IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-02-12 Huasheng Zhang, Nuria Llombart, Juan Bueno, Angelo Freni, Andrea Neto
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OSAS-B: A balloon-borne terahertz spectrometer for atomic oxygen in the upper atmosphere IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-02-07 M. Wienold, A. Semenov, E. Dietz, S. Frohmann, P. Dern, X. Lü, L. Schrottke, K. Biermann, B. Klein, H. W. Hübers
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Loss Characteristics of TeraHertz Surface Waves on Laser Micromachined Textured Metals IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-25 Suzanna Freer, Jie Qing, Pavel Penchev, Stefan Dimov, Stephen M. Hanham, Miguel Navarro-Cía
For the application of geometrically induced THz surface wave technology for communication and sensing, a critical analysis of the propagation characteristics (i.e., dispersion and attenuation) for different textured surfaces should be studied and benchmarked. For the broadband characterization of archetypal textured surfaces (e.g., corrugated plane, 2-D array of blind holes and bed of nails) supporting
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Frequency-Diverse Antenna with Convolutional Neural Networks for Direction of Arrival Estimation in Terahertz Communications IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-25 Mingxiang Stephen Li, Mariam Abdullah, Jiayuan He, Ke Wang, Christophe Fumeaux, Withawat Withayachumnankul
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Distinguishing Polymorphs of Ethenzamide-Saccharin Cocrystal Based on Terahertz and Raman Vibrational Spectroscopic Techniques IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-25 Yaqi Jing, Jiale Zhang, Mei Wan, Jiadan Xue, Jianjun Liu, Jianyuan Qin, Zhi Hong, Yong Du
In this article, two kinds of pharmaceutical crystallized polymorphs of ethenzamide (ETZ) and saccharin (SAC) cocrystal were synthesized by both solution crystallization and solid-state grinding methods. Crystal structure analysis revealed that the primary hydrogen-bonding heterosynthon of amide–imide in the form I and form II of ETZ-SAC cocrystal was the same, but the secondary interactions in the
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Performance of Photoconductive Receivers at 1030 nm Excited by High Average Power THz Pulses IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-25 Tim Vogel, Samira Mansourzadeh, Uttam Nandi, Justin Norman, Sascha Preu, Clara J. Saraceno
In the last few years, many advances have been made in the demonstration of high-average power pulsed THz sources; however, little effort has been made to study compatible sensitive field-resolved detectors. Here, we investigate ErAs:InAlGaAs photoconductive receivers optimized for a probe wavelength of 1030 nm and thus suitable for the new class of high-power ultrafast Ytterbium-based laser sources
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A High-Performance 220–290 GHz Micromachined Waveguide Switch Based on Interference Between MEMS Reconfigurable Surfaces IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-19 Armin Karimi, Umer Shah, Suxian Yu, Joachim Oberhammer
This article presents a highly integrated novel silicon micromachined single-pole-single-throw waveguide switch based on two microelectromechanically reconfigurable switching surfaces (MEMS-RSs), which allows optimizing the switching performance by tuning the interference between the two such MEMS-RSs utilizing integrated electrostatic comb-drive actuators. The switch prototype is implemented with
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A Waveguide-Based Variable Attenuator for Terahertz Applications IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-12 Subash Khanal, Sofia Rahiminejad, Choonsup Lee, Jacob Willem Kooi, Robert Lin, Goutam Chattopadhyay
This article presents a novel waveguide-based terahertz (THz) variable attenuator, integrated with a piezoelectric motor, to achieve precise and fine step values of signal attenuation. A low-resistivity silicon slab, coated with a thin layer of titanium metal, is inserted inside a waveguide that absorbs some of the electromagnetic waves traveling through the guide. Impedance matching is achieved by
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Array of 296-GHz CMOS Concurrent Transceiver Pixels With Phase and Amplitude Extraction Circuits for Improving Reflection-Mode Imaging Resolution IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-05 Pranith Reddy Byreddy, Yukun Zhu, Suprovo Ghosh, Harshpreet Singh Bakshi, Walter Sosa Portillo, Jayson P. Van Marter, Kenneth K. O, Murat Torlak, Wooyeol Choi
A 1 × 3 array of 296-GHz complementary metal oxide semiconductor concurrent transceiver pixels incorporating a low noise amplifier, a differential gain stage, and a double-balanced I/Q mixer and a quadrature local oscillator generator for extraction of baseband signal amplitude and phase in addition to the RF section in an area of ∼ (λ/2) 2 is demonstrated. The effective isotropic radiated power of
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IEEE Transactions on Terahertz Science and Technology Publication Information IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-04
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TechRxiv: Share Your Preprint Research with the World! IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-04
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IEEE Transactions on Terahertz Science and Technology Information for Authors IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-04
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IEEE Microwave Theory and Techniques Society Information IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-04
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A 220–320 GHz High Image Rejection Sideband Separating Receiver for Space-Borne Observatories IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-03 Ebrahim M. Al Seragi, Yashas L. Rajendra, Waleed Ahmad, Mehmet Kaynak, Paul F. Goldsmith, Saeed Zeinolabdedinzadeh
This work presents a novel terahertz sideband separating receiver (SSR) implemented in silicon germanium 0.13 μm BiCMOS technology that covers a broad frequency range of 220–320 GHz. The proposed architecture provides simultaneous observation of spectral lines with a high image rejection ratio (IRR) across the entire operating frequency range. The double downconversion architecture with a first mixer
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A 206–264 GHz Power Amplifier Based on a High-Linearity Cascode Core With 15 dB Gain and 12.2-dBm Psat in 130-nm SiGe BiCMOS IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-03 Zekun Li, Jixin Chen, Zuojun Wang, Wei Hong
A 206–264 GHz wideband power amplifier (PA) with high gain and high output power for a sub-terahertz (sub-THz) high-data-rate communication system is presented. The balanced architecture is employed for power combining while maintaining wideband performance. To enhance the performance of the sub-THz PA, the output power and the small-signal gain characteristics of the differential cascode core with
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Amplitude/Phase Retrieval for Terahertz Holography With Supervised and Unsupervised Physics-Informed Deep Learning IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2024-01-03 Mingjun Xiang, Hui Yuan, Lingxiao Wang, Kai Zhou, Hartmut G. Roskos
Most neural networks proposed for computational imaging (CI) in the terahertz (THz) bands require a large amount of experimental data to optimize their weights and biases. However, obtaining a sufficient number of ground-truth images for training is challenging in the THz domain due to the requirements of environmental and system stability, as well as the lengthy data acquisition process. To overcome
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H-Band High-Power and High-Efficiency Voltage-Controlled Oscillator IC and Waveguide Module IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-12-25 Jinho Jeong, Youngchae Jeon, Yeongmin Jang
We present a high-power and high-efficiency voltage-controlled oscillator (VCO) integrated circuit (IC) and waveguide module operating at H -band (around 230 GHz) using a 250-nm InP HBT technology. The Colpitts oscillator with an LC emitter degeneration is adopted to reduce supply voltage and improve efficiency, where the inductance is implemented by the shorted transmission line. Capacitive feedback
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Neural Network-Based Design of Two-Focal-Spot Terahertz Diffractive Optical Elements IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-12-18 Paweł Komorowski, Marta Kurowska, Mateusz Kaluza, Patrycja Czerwińska, Przemysław Zagrajek, Agnieszka Siemion
This article presents a convolutional neural network approach for the design and optimization of single-input-multiple-output (SIMO) structures for the sub-terahertz spectral range (140 GHz). Two SIMO structures with two output channels have been designed using the proposed neural network approach and an iterative algorithm as a reference. Both structures have been manufactured by means of fused deposition
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Silicon-Micromachined Subterahertz Frequency Beam-Steered Dual-Port Array Antenna IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-12-18 Armin Karimi, Umer Shah, Alireza Madannejad, Joachim Oberhammer
This article presents an unbalanced-fed silicon micromachined dual-port dual-line antenna array. The radiation pattern of the antenna array can be steered in the E -plane by sweeping the frequency and can be switched between a broad and a notched beam by exciting the ports with in-phase or out-of-phase signals. The antenna is designed for and implemented by silicon micromachining. Each single-line
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A Broad-Band Dual-Polarization All-Metal Dichroic Filter for Cryogenic Applications in Sub-THz Range IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-12-01 Daniel Montofré, Denis Meledin, Cristian Daniel Lopéz, Igor Lapkin, Vincent Desmaris, Leif Helldner, Mathias Fredrixon, Sven-Erik Ferm, Victor Belitsky
In this article, we report on the design and characterization of an all-metal, wideband single-layer dichroic filter operating at nonnormal beam incidence. The dichroic filter consists of a perforated metal plate with an angular offset of the perforated channels equal to the beam incidence angle onto the dichroic surface. The fabricated filter is characterized using a specially designed quasi-optical
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Terahertz Planar Cavity Antenna Based on Effective Medium for Wireless Communications IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-12-01 Mingxiang Stephen Li, Rajour Tanyi Ako, Sharath Sriram, Christophe Fumeaux, Withawat Withayachumnankul
Terahertz sources require compact lenses for efficient outcoupling and manipulation of terahertz waves. Traditional terahertz lenses are bulky and require high-precision fabrication techniques, such as micromachining, which limit their flexibility in integrated systems. As an alternative, we present a planar high-gain cavity antenna integrated with a waveguide feed. The antenna is made by laser-etching
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A 1.0-THz High-Gain Metal-Only Transmit-Array Antenna Based on High-Precision UV-LIGA Microfabrication Technology IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-12-01 Zhuo-Wei Miao, Zhenhao Liu, Zhang-Cheng Hao, Yongbin Zeng, Di Zhu, Jia-Hui Zhao, Chen-Yu Ding, Li Cheng, Lei Zhao, Wei Hong
Implementing high-gain antennas operating in exceedingly high THz regions, e.g., the challenging WR-1.0 band, relies significantly on dependable microfabrication technologies. Due to the advantages of high precision, low cost, and high uniformity, this article presents a 1.0-THz 64 × 64-element high-gain metal-only transmit-array (TA) antenna fabricated using ultraviolet photolithography techniques
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Exploring Low-Loss Wideband Substrate-Integrated Image Guides (SIIG) for Terahertz Applications IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-11-13 Mohammad Moradi, Mohammad S. Sharawi, Ke Wu
This article proposes and explores high-performance substrate-integrated image guide (SIIG) techniques for THz applications. Due to its low-loss transmission, planar geometry, and metallic ground plane that can be shared among other circuit components, the SIIG structure is an ideal candidate for THz integrated circuits and systems development. By conducting modal analysis and selecting proper parameters
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A CPW Probe to Rectangular Waveguide Transition for On-Wafer Micromachined Waveguide Characterization IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-11-13 Bernhard Beuerle, James Campion, Oleksandr Glubokov, Umer Shah, Joachim Oberhammer
A new transition from coplanar waveguide probe to micromachined rectangular waveguide for on-wafer device characterization is presented in this article. The transition is fabricated in the same double H-plane split silicon micromachined waveguide technology as the devices under test (DUT), requiring no additional postprocessing or assembly steps. We outline the design and fabrication process of the
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Efficient Anomalous Refraction of THz Beams With a Multilayer Metal–Polymer Huygens' Metasurface IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-11-13 Sergei Kuznetsov, Maksim Tumashov, Vinay K. Killamsetty, Pavel Lazorskiy, Ariel Epstein, Stanislav Glybovski
We describe design principles, fabrication techniques, and experimental testing for a Huygens' metasurface, which deflects a normally incident radiation beam at $f\approx 0.172$ THz toward an angle of 52 $^\circ$ in transmission. The metasurface is comprised of a cascade of five spatially-modulated aluminum impedance sheets photolithographically patterned on 100- $\mu$ m-thick polypropylene substrates
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Guest Editorial IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-11-02 Jose Siles, Imran Mehdi
The 32nd International Symposium on Space Terahertz Technology (ISSTT 2022) was held in Spain for the first time. Baeza is a city full of renaissance buildings and cobbled streets, and one of the 15 UNESCO World Heritage cities in Spain. This was also the first conference after the COVID-19 pandemic, which made the organization of the event more challenging, but also more special. Many colleagues in
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Terahertz Nonlinear Spectroscopy of Liquid Water IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-11-03 Hang Zhao, Yong Tan, Yuejin Zhao, Ming Liu, Liangliang Zhang
Recently, the classical Z -scan technique is considered feasible for the nonlinear measurement of liquid water in the low-frequency terahertz (THz) band. However, this scheme ignores the nonlinear spectral variation of broadband THz pulses, and its investigation of liquid water in a higher THz band (>1 THz) remains challenging until now. Here, we use Z -scan technology to directly measure the nonlinear
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Design and Measurement of a Mode-Suppression Circuit for a G-Band Gyrotron Traveling Wave Tube IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-11-02 Yingjian Cao, Yuan Ma, Guo Liu, Yu Wang, Wei Jiang, Yelei Yao, Jianxun Wang, Yong Luo
In the hot test of our G-band (0.21–0.23 THz) TE 01 -mode gyrotron traveling wave tube (gyro-TWT), the beam current was increased from 3.0 to 3.9 A to obtain a higher gain and output power. However, a strong TE 21 -mode backward-wave oscillation occurred in the nonlinear interaction region. To solve this problem, a novel mode-suppression circuit (MSC) is proposed, designed, and measured in this article
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Impact of Slot Width on Performance of Symmetrical-Slot-Antenna Resonant-Tunneling-Diode Oscillators IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-11-02 Dinh Tuan Nguyen, Gabriele Picco, Petr Ourednik, Christian Spudat, Michael Feiginov
In this article, we show that the output power of symmetrical-slot-antenna resonant-tunneling-diode (RTD) oscillators depends on the slot width. The dependence could be used as a fine-tuning degree of freedom to increase the output power of the oscillators. The fine-tuning mechanism is related to maximizing the RTD-oscillation amplitude by a proper balance between the slot-antenna radiation and ohmic
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A Terahertz Monostatic Transceiver in 90-nm SiGe BiCMOS IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-11-02 Christoph Mangiavillano, Alexander Kaineder, Klaus Aufinger, Andreas Stelzer
A combined common collector harmonic mixer and frequency multiplier is designed to operate at the fourth harmonic in a transceiver at around 0.88 THz in a 90-nm SiGe bipolar CMOS technology with an $f_{T}$ / $f_{\max}$ of 300/480 GHz. The transceiver occupies a chip area of 1.35 $\text{mm}^\text{2}$ with a current consumption of 144 mA when connected to a 3.3-V supply. Measurements reveal an effective
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A Compact Terahertz Multibeam Antenna Based on a Multimode Waveguide Beamforming Structure IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-10-25 Shaoyuan Zhu, Hongda Lu, Talal Skaik, Yong Liu, Yi Wang
In this letter, a fully metallic terahertz (THz) multimode-waveguide-based multibeam antenna operating at the band from 410 to 480 GHz is proposed. The antenna is composed of four waveguide feeders, a multimode waveguide beamforming network, four grooved waveguide phasers and a flare radiation aperture. It is realized by using high-precision Computer Numerical Control (CNC) machining technology. The
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Full-Band Silicon-Micromachined E-Plane Waveguide Bend for Flange-to-Chip Connection IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-10-25 Armin Karimi, Mohammad Mehrabi Gohari, Oleksandr Glubokov, Umer Shah, Joachim Oberhammer
This article presents a novel design of a full-band E -plane waveguide bend for direct flange-to-chip connection. The proposed E -plane bend concept is validated with a reduced-height bend prototype designed for standard WR-3.4 waveguide flange-to-chip connection, fabricated by silicon micromachining, and characterized by de-embedding the S -parameters with a custom-made offset-short calibration kit
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A Transmit Lens Array With High-Gain and Beam-Steering Capabilities at Submillimeter Wavelengths IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-10-13 Maria Alonso-delPino, Sjoerd Bosma, Cecile Jung-Kubiak, Juan Bueno, Goutam Chattopadhyay, Nuria Llombart
This article introduces a novel transmit lens array with beam-steering capabilities for submillimeter-wave space instruments. The transmit array consists of two sparse silicon lens antenna arrays connected by a waveguide array, in which active components can potentially be integrated, arranged in a hexagonal grid. The upper lens array is mechanically actuated to achieve dynamic beam-steering. The bottom
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Frequency Stabilization of a 4.7 THz Quantum Cascade Laser Using a Delay Line Frequency Discriminator IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-10-04 Sajjad Mahdizadeh, Urs U. Graf, Matthias Justen, Jérôme Faist, Mattias Beck, Tudor Olariu, Jürgen Stutzki
Astronomical heterodyne spectrometers, such as upGREAT on the SOFIA telescope, use a powerful quantum cascade laser (QCL) as local oscillator (LO) to observe the atomic oxygen line at 4.7 THz. The free-running laser, although temperature stabilized, is prone to broad effective linewidth and frequency drifts and lacks an absolute frequency reference. In this work, our successful frequency locking of
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Characterization of Microwave Properties of Superconducting NbTiN Films Using TDS IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-10-02 Fedor V. Khan, Elena S. Zhukova, Boris P. Gorshunov, Lenar S. Kadyrov, Artem M. Chekushkin, Andrey V. Khudchenko, Valery P. Koshelets
In this article, we perform systematic study of electrodynamic properties of superconducting NbTiN films at frequencies 0.2–2.5 terahertz (THz) and in temperature range from 4 to 15 K using time-domain spectrometer. The goal is to achieve the best parameters of the films at THz frequencies; that is to reach а tradeoff between the highest possible normal state conductivity σ0 , the smallest London penetration
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A 275-GHz InP HBT H-Band Amplifier With Transmission Line-Based Capacitively Coupled Resonator Matching Technique IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-10-02 Chan-Gyu Choi, Hyun-Hak Jeong, Seung-Hyun Cho, Sooyeon Kim, Ho-Jin Song
This article presents transmission line-based capacitively coupled resonator matching techniques for THz amplifiers and demonstrates the idea in a three-stage differential H-band amplifier in indium phosphide (InP) 250-nm double heterojunction bipolar transistor technology for a general-purpose waveguide gain block. We propose two types of symmetrical capacitively coupled resonator matching circuits
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Characterization of Widefield THz Optics Using Phase Shifting Interferometry IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-09-28 Nicolás Reyes, Ivan Cámara Mayorga, Gerrit Grutzeck, Stephen J.C. Yates, Andrey Baryshev, Jochem Baselmans, Axel Weiss, Bernd Klein
Characterization of wide-field optics in the Terahertz regime imposes new and demanding requirements for testing systems. Basic optical parameters can be determined from scalar planar characterization, obtained using monochromatic or thermal sources located in the instrument focal plane. In contrast, important features, such as the spillover efficiency, wave front error, or aperture efficiency cannot
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A 700 GHz Integrated Signal Source Based on 130 nm InP HBT Technology IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-09-27 Heekang Son, Junghwan Yoo, Doyoon Kim, Jae-Sung Rieh
A 700 GHz integrated signal source has been developed in this work based on a 130 nm InP heterojunction bipolar transistor technology. The circuit consists of a differential 350 GHz oscillator integrated with a frequency doubler. For the oscillator, the common-base cross-coupled topology was employed, while balanced common-emitter structure was adopted for the frequency doubler. The fabricated signal
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Design, Operation, and Characterization of a Laboratory Spatial-Spectral Fourier Transform Interferometer IEEE Trans. Terahertz Sci. Tech. (IF 3.2) Pub Date : 2023-09-26 Jeremy Scott, Chris Benson, Locke Spencer
Subarcsecond spatial resolution observations are an important milestone for far-infrared astronomy. Here, we present the design, operation, and characterization of a laboratory-based spatial-spectral Fourier transform interferometer. Such a system is capable of producing spectral images with enhanced spatial resolution.