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ABSTRACT
A high sensitivity rounded bow-tie antenna was optimized based on electromagnetic simulations. The bicrystal Josephson junction detector with a thin layer of YBCO was located exactly at the bicrystal misorientation point at the center of the antenna. The Au antenna was fabricated on an (100) MgO bicrystal substrate. In the presence of 200 GHz RF radiation, a noise equivalent power (NEP) of around 6×10−12 W Hz−1/2 was measured, with a voltage sensitivity, , of 30 dB with the detector at 60 K. Even though no coupling lens was used, these results are as good as those reported in systems in which the impinging radiation was focused with lenses over the detectors. Thus, important simplification of the system was obtained without loss of sensitivity.
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Notes on contributors
E. Holdengreber
E. Holdengreber received his PhD degree in Electrical Engineering from Ariel University, Israel in 2018. He is specialized in combining superconductors with advanced THz communication. His research interests include microwave, designing superconducting microwave circuits and high resolution radar scanning methods. His present research deals with THz detectors based on high Tc Josephson junctions.
A. G. Moshe
A. G. Moshe received his BSc degree in physics from Ariel University in 2015 and is currently working towards the PhD degree in physics from Tel Aviv University, Israel. His current research activities focuses on THz spectroscopy at low temperatures and Kondo effect in superconducting granular aluminum thin films close to the metal to insulator transition.
M. Mizrahi
M. Mizrahi received his BSc degree in 2008 and his MSc in 2011 from the Department of Electrical and Electronic Engineering of Ariel University. His research interests include designing microwave passive circuit based on superconductors. He is a PhD student in Ariel University and his present research deals with Radar Super Resolution problems.
V. Khavkin
V. Khavkin is a MSc student in electrical engineering, received his BSc degree from the Department of Physics of Technion Israel Institute of Technology. His research interests include complex conductivity and Corbino geometry measurements.
S. E. Schacham
Professor S. E. Schacham is Dean of Students of Ariel University, and is the founder of the department of Electrical and Electronics Engineering. He served as Dean of Engineering for 14 years. His main research interests include semiconductor characterization, infrared detectors, and quantum electronics.
E. Farber
E. Farber received his MSc degree in Electrical Engineering and PhD degree in Physics from Tel-Aviv University, Israel in 1997 and 2001, respectively. In 2002, he joined Ariel University, Department of Electrical and Electronic Engineering as a faculty member. He is a head of the laboratory of Superconductivity and Optical/Microwave Spectroscopy. His main research interests include RF/microwave devices, such as directional couplers, antennas and filters for wireless communications, millimeter and submillimeter-wave heterodyne and direct detector receivers, frequency sources in the terahertz region, antennas, imaging and spectroscopy, novel microwave and IR materials, high-temperature superconducting electronics, micro/nano fabrication, and processing.