Article
Physics, Applied
Kevin Froberger, Benjamin Walter, Melanie Lavancier, Romain Peretti, Guillaume Ducournau, Jean-Francois Lampin, Marc Faucher, Stefano Barbieri
Summary: The study introduces a micro-mechanical terahertz detector fabricated on a silicon on insulator substrate, operating at room temperature. It achieves a high responsivity with a broad frequency response and fast thermal response time.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Behrokh Beiranvand, Alexander S. Sobolev, Michael Yu Larionov, Leonid S. Kuzmin
Summary: A 2D periodic array of cold-electron bolometers was developed and tested, arranged into a wideband frequency selective metasurface that absorbs more than 70% of incident power in the range of 100-800GHz. Preliminary experiments and noise performance simulations demonstrated high voltage responsivity and realization of background noise-limited performance in the array.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Alexander Shurakov, Ivan Belikov, Anatoliy Prikhodko, Margarita Ershova, Gregory Goltsman
Summary: In this study, a nearly all-dielectric hot electron bolometer mixer compatible with integrated Si photonic crystals was developed. The on-chip power distribution networks of the mixer resulted in input losses of 2.4 dB and far-field radiation patterns with a gain of 12.1 dB and a side lobe level below -11 dB. The mixer was designed for spectral measurements at 2.7 THz and can be used as part of an on-chip spectrometer or as a standalone device.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Electrical & Electronic
Isao Morohashi, Yoshihisa Irimajiri, Akira Kawakami, Tadashi Kishimoto, Pham Tien Dat, Atsushi Kanno, Norihiko Sekine, Iwao Hosako
Summary: We have successfully demonstrated wireless transmission of quadrature phase-shift keying (QPSK) signals at 2 and 3 THz-bands. The proposed system, consisting of a photonics-based transmitter and a heterodyne receiver system, utilizes optical combs and a hot electron bolometer mixer (HEBM) to generate and receive THz signals. Despite higher atmospheric attenuation, the transmitted signals were received with sufficient SNRs due to the high sensitivity of the HEBM. The demodulated signal had error vector magnitude (EVM) values of about 22% and 30% for the 2 and 3 THz-bands, respectively.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Pan Pan, Lin Zhang, Hengshan Cui, Jinjun Feng
Summary: This paper describes a terahertz power module based on a 0.34 THz traveling wave tube. The module employs a modified slow wave structure to achieve broad bandwidth. It provides high output power and gain in the frequency range of 0.33 THz to 0.355 THz.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Chemistry, Analytical
Rahul Yadav, Florian Ludwig, Fahd Rushd Faridi, J. Michael Klopf, Hartmut G. Roskos, Sascha Preu, Andreas Penirschke
Summary: This study presents the characterization of a Zero-bias Schottky diode-based THz detector that operates up to 5.56 THz. The detector was tested using a table-top system up to 1.2 THz and a Free-Electron Laser facility at frequencies ranging from 1.9 to 5.56 THz. Two measurement techniques were employed to differentiate between sub-ns-scale and ms-scale responsivity. The results show that the detector has a noise equivalent power (NEP) in the range of 10-17 pW/vHz and a voltage and current responsivity of approximately 500 kV/W and 100 mA/W, respectively, within the frequency range of 0.2 to 1.2 THz.
Article
Chemistry, Analytical
Xu Wang, Ting-Peng Li, Shu-Xia Yan, Jian Wang
Summary: This paper presents the operation principle, module designs, theoretical analysis, and experimental validation of a room-temperature CMOS monolithic resonant triple-band THz thermal detector. The detector consists of a compact triple-band octagonal ring antenna and a sensitive PTAT sensor, showing advantages of room-temperature operation, low cost, easy integration, and mass production. Good experimental results are obtained, providing great potential for multiband THz sensing and imaging systems.
Article
Nanoscience & Nanotechnology
Shen Liu, Yanping Chen, Huailei Lai, Mengqiang Zou, Hang Xiao, Peijing Chen, Bin Du, Xunzhou Xiao, Jun He, Yiping Wang
Summary: Nanomechanical bolometers are suitable for light analysis, but conventional wafer-based devices have limited practical applications due to the need for special equipment and conditions. A new nanoscale optomechanical bolometer using all-optical actuation and measurement approach was developed, showing compact design and high resolution with photothermal sensitivities. The design with integrated all-optical fiber structure and vacuum sealing tube improved signal-to-noise ratio for applications in medicine, industrial manufacturing, nanoscience, and astronomy outside specialized laboratories.
Article
Physics, Multidisciplinary
Chenyu Yao, Mengjie Jiang, Dong Wang, Libo Zhang, Ning Zhang, Lin Wang, Xiaoshuang Chen
Summary: A self-mixing terahertz detector based on a hemispherical silicon lens and antenna-coupled InGaAs/AlGaAs high electron mobility transistor (HEMT) is developed, enabling wide spectrum detection and improved performance.
FRONTIERS IN PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Rana Nazifi, Roya Mohajeri, Zeynab Alipour, S. Iman Mirzaei, Mehdi Ahmadi-Boroujeni, M. A. Vesaghi, J. -C. Grivel, Mehdi Fardmanesh
Summary: This study investigates the response of a monolithic high Tc transition-edge bolometer to approximately 3 mm wave radiation. The results indicate that the electrical conductivity of the YBCO film affects the absorption performance of the detector. The design of the meander line pattern on the bolometer structure allows for maximum absorption and responsivity when aligned with the polarized radiation source.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Nanoscience & Nanotechnology
Leonardo Vicarelli, Alessandro Tredicucci, Alessandro Pitanti
Summary: This research introduces micromechanical bolometers based on silicon nitride trampoline membranes as a room-temperature imaging technique for terahertz frequencies. The technology shows good performance and ease of fabrication, making it a potential candidate for cheap terahertz imaging and related applications.
Article
Instruments & Instrumentation
M. Stephens, C. S. Yung, N. A. Tomlin, A. Vaskuri, I Ryger, M. Spidell, M. G. White, T. Jenkins, J. Landry, T. Sereke, J. H. Lehman
Summary: A room temperature electrical substitution radiometer is described for measuring laser power as an absolute standard, achieving high accuracy over a wide range of wavelengths, beam diameters, and powers. The instrument uses a silicon microfabricated bolometer with carbon nanotube absorbers and commercial surface mount thermistors. Validation was done against NIST and AFMETCAL standards.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Nanoscience & Nanotechnology
Mette Bybjerg Brock, Emil Visby Ostergaard, Anders C. Wulff, Asger Bech Abrahamsen, Luise Theil Kuhn
Summary: The pre-neutron characterization of a superconducting transition edge bolometric device sensitive to neutrons by an enriched boron carbide layer is performed in this study. Laser simulation is used to create heat from neutron absorption, and measurements are conducted on coated and non-coated pixels. The results show that the effective specific heat is highly dependent on the input pulse duration and the detector has a high detectivity.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Multidisciplinary Sciences
Qinxi Qiu, Wanli Ma, Jingbo Li, Lin Jiang, Wangchen Mao, Xuehui Lu, Niangjuan Yao, Yi Shi, Zhiming Huang
Summary: In this study, a room temperature THz photodetector utilizing the electromagnetic induced well mechanism with an SOI-based structure was reported. The detector achieved high sensitivity, fast response, and low noise equivalent power, paving the way for the realization of Si-based THz focal plane arrays with wide applications.
Article
Chemistry, Analytical
Liang Hong, Lanxia Wang, Miao Cai, Yifan Yao, Xuguang Guo, Yiming Zhu
Summary: A highly sensitive room-temperature graphene photothermoelectric terahertz detector with an efficient optical coupling structure of asymmetric logarithmic antenna was developed by planar micro-nano processing technology and two-dimensional material transfer techniques. The device showed a high photoresponsivity of 1.54 A/W, a noise equivalent power of 19.8 pW/Hz(1/2), and a response time of 900 ns at 105 GHz under zero bias. The electrode-induced doping of graphene channel near the metal-graphene contacts was found to play a key role in the terahertz PTE response.
Article
Nanoscience & Nanotechnology
Leonardo Viti, Alisson R. Cadore, Xinxin Yang, Andrei Vorobiev, Jakob E. Muench, Kenji Watanabe, Takashi Taniguchi, Jan Stake, Andrea C. Ferrari, Miriam S. Vitiello
Summary: In the terahertz frequency range and at room temperature, ultrafast and sensitive light detection is achieved using antenna-coupled graphene field effect transistors integrated with high-bandwidth chips, paving the way for various applications such as time-resolved spectroscopy and quantum control.
Article
Engineering, Electrical & Electronic
M. Asad, S. Majdi, A. Vorobiev, K. Jeppson, J. Isberg, J. Stake
Summary: Graphene field-effect transistors (GFETs) operating at high frequencies show improved performance when using a diamond substrate, which allows for higher oscillation frequencies and efficient heat dissipation. GFET-on-diamond technology has the potential to achieve sub-terahertz frequency performance.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Pharmacology & Pharmacy
Anis Moradikouchi, Anders Sparen, Staffan Folestad, Jan Stake, Helena Rodilla
Summary: In this paper, the authors explored the use of the terahertz frequency-domain technique for non-destructive and fast measurement of porosity in pharmaceutical tablets. The results showed that the technique was highly sensitive to variations in design factors such as filler particle size and compaction force.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2022)
Article
Engineering, Chemical
Marlene Bonmann, Diana Carolina Guio-Perez, Tomas Bryllert, David Pallares, Martin Seemann, Filip Johnsson, Jan Stake
Summary: This paper presents the development and validation of a sub-millimeter wave range-Doppler radar for non-intrusive sensing of solids concentrations in gas-solids systems. The radar system offers the ability to penetrate opaque materials, measure local solids velocity, and provide reflected radar power with high spatial resolution. The experimental results demonstrate that the radar system provides reliable measurements of solids concentrations with high accuracy.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Pharmacology & Pharmacy
Anis Moradikouchi, Anders Sparen, Olof Svensson, Staffan Folestad, Jan Stake, Helena Rodilla
Summary: In this study, the feasibility of using terahertz spectroscopy combined with multivariate analysis for the quantification of API concentration and tablet density in pharmaceutical tablets was explored. The results showed that terahertz spectroscopy can accurately measure tablet density and has lower scattering effects compared to Raman and NIR spectroscopy.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2023)
Article
Engineering, Electrical & Electronic
Juan Cabello-Sanchez, Vladimir Drakinskiy, Jan Stake, Helena Rodilla
Summary: Planar Goubau lines show promise for terahertz (THz) applications, but existing filters lack clear design procedures. In this study, we propose a design for a bandpass/bandstop filter by periodically loading the line with capacitively-coupled lambda/2 resonators. The filter's working principle is explained using a transmission-line model. We fabricated and tested a passband filter centered at 0.9 THz on a 10-µm silicon-membrane substrate, demonstrating good agreement between measurements and simulations.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Applied
Y. Gan, B. Mirzaei, J. R. G. Silva, S. Cherednichenko, F. van der Tak, J. R. Gao
Summary: We have studied the THz heterodyne detection using MgB2 hot electron bolometer (HEB) mixers with sub-micrometer size. The receiver noise temperatures of HEB-A and HEB-B were measured to be 2590 K and 2160 K at 1.6 THz and 5 K. After correction, both HEBs show receiver noise temperatures around 1600 K, referenced to the front of AR-coated Si lenses. The measured IF noise bandwidth is 11 GHz for both devices, and the required LO power is about 13 mu W. In addition, a step-like structure was observed in the IV curves, which is attributed to the thickness variations of the MgB2 films.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
R. Voigt, M. Wienold, D. Jayasankar, V. Drakinskiy, J. Stake, P. Sobis, L. Schrottke, X. Lu, H. T. Grahn, H-W Huebers
Summary: We demonstrate the frequency stabilization of a terahertz quantum-cascade laser (QCL) using the Lamb dip of a D2O rotational transition absorption line. A Schottky diode harmonic mixer is used to generate a downconverted QCL signal, which is measured by a spectrum analyzer and shows a full width at half maximum of 350 kHz limited by high-frequency noise beyond the stabilization loop bandwidth.
Article
Physics, Applied
S. Majdi, V. Djurberg, M. Asad, A. Aitkulova, N. Suntornwipat, J. Stake, J. Isberg
Summary: In this study, the researchers successfully fabricated graphene-diamond heterostructures by transferring graphene to an ultra-pure single-crystalline diamond substrate. Hall-effect measurements were conducted to investigate the charge transport properties in these devices. Enhanced hole mobility of 2750 cm(2) V-1 s(-1) was observed at room temperature when using diamond with reduced nitrogen impurity concentration, and the upper limit for mobility was determined by electrostatically varying the carrier concentration. These results are promising for enabling room-temperature applications of carbon-carbon devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Energy & Fuels
Diana Carolina Guio-Perez, Marlene Bonmann, Tomas Bryllert, Martin Seemann, Jan Stake, Filip Johnsson, David Pallares
Summary: The aim of this work is to demonstrate the value of radar technology for studying experimentally the solids flows in gas-solids fluidized beds. The work presents original results regarding the solids concentration and velocity acquired in a non-intrusive manner from a cold flow model. The radar technique applied in this work is a promising technique for detailed characterization of the solids flow in fluidized beds, offering high spatial and temporal resolutions, allowing the determination of both solids velocity and concentration, and having a reasonably high penetration depth.
Article
Engineering, Electrical & Electronic
Tomas Bryllert, Marlene Bonmann, Jan Stake
Summary: This work presents a 340-GHz frequency-modulated continuous-wave (FMCW) pulse-Doppler radar based on a transceiver module with high output power and wide bandwidth. The radar system demonstrates high sensitivity and resolution in detecting and mapping both single particles and particle clouds at a 5-m distance. The ability to monitor particle dynamics is valuable in various industrial applications.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Juan Cabello-Sanchez, Vladimir Drakinskiy, Jan Stake, Helena Rodilla
Summary: In this work, a termination for planar Goubau lines (PGLs) based on an exponentially tapered corrugated line is proposed to achieve broadband impedance-matched loads with small reflections. A 400 μm-long PGL load was fabricated on a 10 μm-thick silicon substrate, and the measured reflections were below -19 dB in the frequency range of 0.5-1.1 THz, indicating good agreement between simulations and measurements.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Divya Jayasankar, Vladimir Drakinskiy, Peter Sobis, Jan Stake
Summary: This paper presents the design and sensitivity analysis of a 4.7-THz fundamental mixer operating at ambient temperatures. The critical circuit parameters for mixer performance at supra-THz frequencies are identified, highlighting the progress towards a room-temperature heterodyne supra-terahertz receiver.
2022 47TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ 2022)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Divya Jayasankar, A. I. Hernandez-Serrano, Rachel A. Hand, Jan Stake, Emma MacPherson
Summary: The study indicates that frequency-dependent properties of polyvinyl alcohol-based hydrogel phantoms are similar to human skin, showing promising prospects for being utilized as a skin equivalent.
2022 52ND EUROPEAN MICROWAVE CONFERENCE (EUMC)
(2022)
Article
Infectious Diseases
Elise Hyser, Drashti Antala, Harvey Friedman, Jonathan Stake
Summary: This article presents a case of an elderly female who underwent a workup for acute blood loss anemia and incidentally discovered abdominopelvic actinomycosis. The case exemplifies how actinomycosis can mimic the presentation of cancer, with risk factors including a history of ischemic colitis and lumbar laminectomy.
