Article
Physics, Applied
Xiaohui Zhang, Kang Liu, Benjian Liu, Bing Dai, Yumin Zhang, Jiaqi Zhu
Summary: A thickness asymmetric electrode structure was designed and prepared on an oxygen-terminated type IIa diamond, exhibiting apparent photo-induced rectification property. This mechanism has rarely been studied in diamond detectors and can be applied to other fields related to diamond surface potential.
APPLIED PHYSICS LETTERS
(2023)
Article
Astronomy & Astrophysics
L. Biggio, G. Vernardos, A. Galan, A. Peel, F. Courbin
Summary: Strong gravitational lensing is a powerful tool for studying mass distribution in galaxies. This work introduces a continuous neural field to accurately predict the lensing potential of any position in the image plane. The model is able to fit imaging data and accurately recover the properties of both smooth potential and perturbations, without the need for pretraining or large sets of labeled data.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Chenyue Sun, Hui Guo, Lei Yuan, Haohang Yang, Xiaoyan Tang, Yimeng Zhang, Qingwen Song, Yuming Zhang
Summary: This letter fabricates and analyzes silicon carbide (SiC) ultraviolet (UV) phototransistors with bidirectional bias response. The experimental results show that the fabricated phototransistor exhibits stable photoelectric and transistor characteristics under both forward and reverse voltages, thanks to the design of the epitaxial layers. The difference in photocurrent mainly arises from the variation in absorption coefficient with wavelength and the change in the width of the space charge regions.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Nuclear Science & Technology
S. Cesaroni, F. Bombarda, S. Bollanti, C. Cianfarani, M. Marinelli, L. Mezi, E. Milani, D. Murra, D. Pacella, S. Palomba, C. Verona, G. Verona-Rinati
Summary: Previous studies have shown that installing Soft X-ray and UV diamond photodetectors at JET and FTU can achieve excellent results, indicating the great potential of such devices for fusion plasma diagnostics. This study investigates the detection capabilities of two additional diamond detector layouts, optimized for high-energy photons and fast events in the lower energy range, respectively. The results allow the design of a diamond-based tomography system for future fusion devices.
FUSION ENGINEERING AND DESIGN
(2023)
Article
Engineering, Electrical & Electronic
Kaitlin Hellier, Akyl Swaby, Jennifer Ott, Shiva Abbaszadeh
Summary: Polyimide (PI) is used as a hole-blocking layer in high-resistivity photoconductors and can effectively suppress dark current. Accurate voltage drop measurement in the photoconductor is crucial for performance evaluation. In this study, we determined the voltage drop across a-Se interfaced with a thin layer of PI and characterized its temporal resolution, dynamic range, and quantum efficiency. The photoresponse of the detector was characterized using light-emitting diodes. We found that the voltage drop across a-Se is 91% of the total applied voltage, resulting in a QE near unity at 405 nm with specific electric fields.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Analytical
Stefania Tzoka, Maria Tarara, Dimosthenis L. Giokas
Summary: This work introduces photography-based photometry as a complementary method to digital image colorimetry for UV photometric analysis. By repurposing historical photography and utilizing inexpensive materials, accurate UV absorbance measurements can be achieved at a low cost and with simplified operation, making it promising for routine applications in resource-limited settings.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Electrical & Electronic
Carlos Avila-Avendano, Maria I. Pintor-Monroy, Adelmo Ortiz-Conde, Jesus A. Caraveo-Frescas, Manuel A. Quevedo-Lopez
Summary: This study demonstrates large-area compatible, solar-blind deep-ultraviolet sensors based on active pixels with CMOS amplifiers. The sensors exhibit high responsivity and output voltage signals, and the integration of Ga-2 O-3 sensors on the same substrate ensures compatibility with large-area applications. The active pixel sensor shows improved performance compared to discrete sensors.
IEEE SENSORS JOURNAL
(2021)
Article
Nuclear Science & Technology
S. Cesaroni, M. Angelone, G. Apruzzese, F. Bombarda, L. Gabellieri, M. Marinelli, E. Milani, S. Palomba, G. Pucella, A. Romano, C. Verona, G. Verona-Rinati, C. Centioli, A. Grosso, V Piergotti, G. Rocchi, A. Sibio, B. Tilia
Summary: The report discusses the successful installation of two CVD single crystal diamond detectors in the FTU tokamak, which allowed for observation of various plasma events. The promising results have led to the initiation of an R&D program for diamond-based bolometers.
FUSION ENGINEERING AND DESIGN
(2021)
Article
Chemistry, Physical
Marco Girolami, Valerio Serpente, Matteo Mastellone, Marco Tardocchi, Marica Rebai, Qinglei Xiu, Jinlong Liu, Zhijia Sun, Yubin Zhao, Veronica Valentini, Daniele M. Trucchi
Summary: This study demonstrates the fabrication of vertical metal-semiconductor-metal detectors for UV-C radiation using single-crystal chemical vapour deposition (CVD) diamond samples with asymmetric Schottky contacts. The detectors show solar blindness and zero power consumption under photovoltaic operating conditions, with a high UV/Vis rejection ratio. The excellent structural quality and charge transport properties of the diamond bulk enable the detectors to achieve excellent performance even at low electric fields.
Article
Instruments & Instrumentation
E. Bossini
Summary: The CMS Precision Proton Spectrometer (PPS) uses timing detectors based on planar single crystal CVD diamonds to measure the time of arrival of scattered protons in the LHC's very forward region. This information is used to determine the longitudinal position of the proton interaction vertex and reduce background noise. The timing system was upgraded for Run 3, aiming to achieve a timing resolution of better than 30 ps for protons with TeV energy. This article provides an overview of the PPS timing system and briefly discusses the detector performance in Run 2, as well as outlining the Run 3 upgrade plan.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2023)
Article
Chemistry, Multidisciplinary
Zoltan Karaszi, Marcell Mathe, Peter Salamon, Agnes Buka, Antal Jakli
Summary: This study investigates plano-convex lens-shaped nematic liquid crystal droplets with negative dielectric anisotropy in magnetic and/or AC electric fields. Experimental observations reveal the formation of inversion walls and radial director structures under specific conditions. The orientation of the central region of the droplets can be manipulated by applying magnetic and electric fields.
Article
Instruments & Instrumentation
Konstantin Zyablyuk, Alexey Popovich, Victor Ralchenko, Vladimir Yurov
Summary: This study investigates the effect of light illumination on the polarization/depolarization processes of diamond detectors made from high-quality single-crystal CVD diamonds. The results show that near-UV and blue light can polarize the detector by filling the charge traps, while longer wavelengths have little effect. Without biasing, light illumination can accelerate the depolarization process, with 365 nm wavelength light being able to restore the highly polarized detector to its initial state in less than 300 milliseconds.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Engineering, Electrical & Electronic
Domenico Longo, Gaetano Giudice, Giuseppe D'Arrigo, Antonella Sciuto
Summary: This work presents a compact, portable, and remotely operable apparatus for optical absorbance measurements in the ultraviolet region. The system, which utilizes a commercial LED as the light source and a specially designed photo-detector, demonstrates good sensitivity and reliability. It is particularly suitable for measuring low-level concentrations of SO2 in volcanic environments. The laboratory tests and calibration for SO2 monitoring are discussed in detail.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Lejie Xu, Jinlin Du, Haoning Wang, Xiaocheng Guo, Kaiyan Tong, Zhiyou Zhong, Chunyong Yang, Jin Hou, Hong Tao, Hao Long, Jing Yang
Summary: Wide-bandgap MgZnO shows great potential in direct-conversion X-ray detectors, as demonstrated by the significantly improved signal-to-noise ratio and response time after Mg doping. The Ag-Mg0.19Zn0.81O-Ag photoconductive detector with optimal Mg contents exhibits high sensitivity, fast response time, and large signal-to-noise ratio.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Chemistry, Analytical
Jiaxiong Sun, Zheng Li, Xiaodan Li, Xinqing Li, Xinyi Cai, Zewen Tan, Manwen Liu, Hongfei Wang
Summary: This paper proposes a new structure for silicon drift detectors that offers improved performance compared to traditional structures. By adjusting the gap between the cathode rings, the surface electric field distribution can be optimized, resulting in better detector performance.
