Article
Engineering, Electrical & Electronic
Sourangsu Banerji, Yu Shi, Vivian Song-En Su, Udayan Ghosh, Jacqueline Cooke, Yong Lin Kong, Lei Liu, Berardi Sensale-Rodriguez
Summary: This study demonstrates a 3-D printable, low-cost terahertz spectral splitter that disperses incident broadband THz radiation at a specified distance. The results show that through inverse design, diffractive optics can be designed to split broadband incident spectrum in any desired fashion.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
Article
Optics
Zoltan Tibai, Gergo Krizsan, Gyorgy Toth, Gabor Almasi, Gergo Illes, Laszlo Palfalvi, Janos Hebling
Summary: Several microstructured lithium niobate THz pulse sources have been suggested for high-energy applications in recent years. Among them, reflective and transmissive nonlinear slabs are adopted for semiconductors. These new sources are scalable in both THz energy and size, and can outperform existing contact grating sources in diffraction and THz generation efficiency.
Article
Engineering, Electrical & Electronic
Mario Mueh, Susanne Brandl, Philipp Hinz, Christian Waldschmidt, Christian Damm
Summary: The most proficient instrument for rapid measurements of broadband terahertz spectra is the time-domain spectrometer, driven by a strong need for fast and precise instrumentation in application-oriented research. This study proposes an adapted network analysis calibration scheme for magnitude- and phase-correct wideband scattering parameter measurements, validated through a comparison of simulation and measurement results.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
Article
Optics
Hongyu Li, Yu Yang, Chuanming Huang, Longquan Dai, Mengfan Cheng, Xuan Xiong, Qi Yang, Ming Tang, Deming Liu, Lei Deng
Summary: This paper proposes a fast, precise, and low-cost scheme for calibrating coherent optical transmitters using multi-tone signals. The scheme can simultaneously calibrate the frequency response and IQ skew of the transmitter with a single measurement. Experimental results demonstrate the effectiveness of this calibration method.
Article
Optics
Harald Moser, Johanne Waclawek, Walter Poelz, Bernhard Lendl, B. ernhard l Endl
Summary: This paper demonstrates the spectral beam combination of multiple single mode laser sources using narrowband spectral filters arranged on the perimeter of regular polygons. The co-alignment and co-propagation of the laser beams are reasonably achieved with this simple geometric design. The spectroscopic applicability is displayed through spatial filtering, mode-matching, and coupling of the combined beams into an astigmatic mirror multipass cell with a length of 76 meters.
Article
Geochemistry & Geophysics
Xuedi Chen, Fei Xing, Zheng You, Xing Zhong, Kaihua Qi
Summary: The on-orbit geometric calibration method based on star sources observation adjusts the satellite attitude to detect star sources, establishing a high-accuracy "camera-star sensor" joint geometric calibration model. This method effectively reduces errors and is suitable for on-orbit autonomous calibration.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Computer Science, Hardware & Architecture
Minkyu Sung, Sang-Rok Moon, Eon-Sang Kim, Sungmin Cho, Joon Ki Lee, Seung-Hyun Cho, Tetsuya Kawanishi, Ho-Jin Song
Summary: The paper comprehensively analyzes and compares various potential THz communications systems with a focus on photonics-based THz transmitters. The research indicates that optical and phase noise have a significant impact on system performance.
IEEE WIRELESS COMMUNICATIONS
(2021)
Article
Automation & Control Systems
Anh-Tuan Dang, Quang-Cherng Hsu, Tat-Tai Truong
Summary: The study proposes a method for reconstructing two-dimensional profiles of ring-shaped objects using image processing, creating a point cloud for automatic measurement with favorable correlation to data from the ATOS measurement system.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Craig R. Donaldson, Liang Zhang, Michael Harris, Matthew J. Beardsley, Peter G. Huggard, Colin G. Whyte, Adrian W. Cross, Wenlong He
Summary: The study investigates the manufacturing and wave dispersion characteristics of a 0.372 THz 8F HCIR, demonstrating its suitability for use in high power frequency tunable Gyroresonant THz sources. A TE11 to TE61 7F HCW mode converter was designed and constructed to measure the wave dispersion of the 8F HCIR, with measured results aligning well with simulated characteristics.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Instruments & Instrumentation
Kenji Ueda, Masaki Nishiura, Naoki Kenmochi, Zensho Yoshida, Kaori Nakamura
Summary: The research upgraded the CIS system by implementing an electron multiplier CCD and a CIS cell. It validated the linearity of the phase relation on the wavelength near the He II line and found that using two spectral lines of Ti and Zn lamps for calibration is reliable and sufficient.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Engineering, Electrical & Electronic
Katrina D. Dambul, Ghafour Amouzad Mahdiraji, Nizam Tamchek, Mohd Fahmi Azman, Wei Ru Wong, Faisal Rafiq Mahamd Adikan
Summary: A new and simple fabrication technique has been demonstrated for the fabrication of a doped flat fiber with dual airholes, showing good light guiding capability and flexibility in core structure arrangement. This cost-effective technique allows for the fabrication of a wide range of complex multistructured flat fibers with accurate core dimensions for future light guiding devices and optical sensor applications.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Telecommunications
Mikail Erdem, Ammar Saleem, Ozgur Gurbuz, Cansu Ecemis, Akhtar Saeed
Summary: This letter presents an analytical model for THz band path loss, which is frequency, distance, and altitude-dependent. The model is obtained by cascaded regression of transmittance data from LBLRTM propagation analysis tool, considering altitudes from the sea-level to 1 km, distances from 1 m to 100 m, and frequencies within 0.79-0.91 THz and 0.93-0.94 THz. The proposed approach achieves high accuracy in propagation data and provides a simple, closed-form expression for designing Terahertz band drone communications.
IEEE COMMUNICATIONS LETTERS
(2023)
Article
Telecommunications
Mikail Erdem, Ammar Saleem, Ozgur Gurbuz, Cansu Ecemis, Akhtar Saeed
Summary: In this article, a frequency, distance, and altitude-dependent analytical model is presented for THz band path loss. The model is derived from cascaded regression of transmittance data obtained from the Line-by-Line Radiative Transfer Model (LBLRTM) propagation analysis tool. The model takes into account altitudes ranging from sea-level to 1 km, distances ranging from 1 m to 100 m, and frequencies within 0.79-0.91 THz and 0.93-0.94 THz. The proposed model achieves high accuracy in predicting propagation data and provides a simple closed-form expression for the design of THz band drone communications.
IEEE COMMUNICATIONS LETTERS
(2023)
Article
Spectroscopy
Blazej Galinski, Jaroslaw Chojnacki, Ewa Wagner-Wysiecka
Summary: A new o-hydroxyazocompound L bearing pyrrole residue was synthesized using a simple method, and its structure was confirmed and analyzed by X-ray diffraction. This new chemosensor was found to be a selective spectrophotometric regent for copper(II) in solution and can also be used to prepare selective colorimetric sensing materials for copper(II) detection. The colorimetric response of the proposed systems showed a distinct color change from yellow to pink, allowing for the determination of copper(II) at a concentration level of 10-8 M in both model and real water samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Engineering, Electrical & Electronic
Sebastian Schramm, Johannes Rangel, Daniela Aguirre Salazar, Robert Schmoll, Andreas Kroll
Summary: This article compares different types of camera calibration targets in the visible, near infrared, medium-wave infrared, and long-wave infrared spectral ranges, finding that a single target can provide good results across all ranges, which is particularly important for the extrinsic calibration of cameras of different wavelengths. The contrast-to-noise ratio and different OpenCV feature detection algorithms are shown to be reasons for varying calibration quality with different targets.
IEEE SENSORS JOURNAL
(2021)
