Glushkov Egor I, Chiginev Alexander V, Kuzmin Leonid S, Revin Leonid S
Institute for Physics of Microstructures of RAS, GSP-105, Nizhny Novgorod, 603950, Russia.
Nizhny Novgorod State Technical University n.a. R. E. Alekseev, GSP-41, Nizhny Novgorod, 603950, Russia.
Beilstein J Nanotechnol. 2022 Mar 28;13:325-333. doi: 10.3762/bjnano.13.27. eCollection 2022.
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 W/Hz; power dynamic range = 1·10.
开展了基于集成到对数周期天线中的一系列约瑟夫森YBaCuO晶界结曲折线的宽带接收系统建模。研究了该系统的电磁特性，即幅度频率特性、方向图以及每个约瑟夫森结中吸收功率的占比。基于所得结果，进行了一维阵列的数值模拟。计算了探测器的直流特性，即针对250 GHz外部信号的电流-电压特性、响应度、噪声和噪声等效功率（NEP）。找到了获得最小NEP的最佳结数。使用一系列结可使响应度提高2.5倍，NEP值提高1.5倍，功率动态范围提高5倍。对于通过磁控溅射在ZrYO双晶衬底上制备的典型YBaCuO约瑟夫森结，在77 K温度下获得了以下参数：响应度 = 9 kV/W；NEP = 3·10 W/Hz；功率动态范围 = 1·10 。
