Journal
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
Volume 13, Issue -, Pages 325-333Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.13.27
Keywords
array; electromagnetic modeling; log-periodic antenna; RCSJ model; series Josephson junctions; YBaCuO Josephson junction
Funding
- Russian Science Foundation [20-79-10384]
- Russian Science Foundation [20-79-10384] Funding Source: Russian Science Foundation
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In this study, a model of a broadband receiving system based on a meander series of Josephson YBaCuO grain boundary junctions integrated into a log-periodic antenna was developed. The electromagnetic properties of the system were investigated, and a numerical simulation of one-dimensional arrays was carried out. The performance of the detector, including current-voltage characteristic, responsivity, noise, and NEP, was calculated. The results showed that using a series of junctions can significantly improve the responsivity, NEP value, and power dynamic range.
Modeling of a broadband receiving system based on a meander series of Josephson YBaCuO grain boundary junctions integrated into a log-periodic antenna was carried out. The electromagnetic properties of the system, namely amplitude-frequency characteristic, beam pattern, and fraction of the absorbed power in each Josephson junction were investigated. Based on the obtained results, a numerical simulation of one-dimensional arrays was carried out. The dc characteristics of the detector were calculated, that is, current-voltage characteristic, responsivity, noise, and noise-equivalent power (NEP) for a 250 GHz external signal. The optimal number of junctions to obtain the minimum NEP was found. The use of a series of junctions allows one to increase the responsivity by a factor of 2.5, the NEP value by a factor of 1.5, and the power dynamic range by a factor of 5. For typical YBaCuO Josephson junctions fabricated on a ZrYO bicrystal substrate by magnetron deposition, the following parameters were obtained at a temperature of 77 K: responsivity = 9 kV/W; NEP = 3.10(-13) W/Hz((1/2)); power dynamic range = 1.10(6).
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