Series YBCO grain boundary Josephson junctions as a terahertz harmonic mixer
Series YBCO grain boundary Josephson junctions as a terahertz harmonic mixer
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DOI：
10.1088/1361-6668/ab5e13
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发表时间：
2019-12
影响因子：
3.6
通讯作者：
Mei Yu;H. Geng;T. Hua;D. An;Weiwei Xu;Zhi Ning Chen;Jian Chen;Hua-bing Wang;Peiheng Wu
中科院分区：
文献类型：
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作者：
Mei Yu;H. Geng;T. Hua;D. An;Weiwei Xu;Zhi Ning Chen;Jian Chen;Hua-bing Wang;Peiheng Wu
约瑟夫森器件已经证明了在太赫兹频率下作为谐波混频器工作的能力。低温器件，特别是Nb-Nb点接触已被证明是特别成功的。然而，这些装置的实际应用受到利用液氦的需要的限制。为了克服这一限制，我们研究了使用高Tc设备。本文报道了一系列YBa 2Cu 3 O 7 −δ（YBCO）晶界约瑟夫森结在零偏压下的154次谐波混频。我们已经集成了一个曲折系列的三个双晶体YBCO约瑟夫森结与对数周期天线。当正确操作时，这种配置允许达到比单个结可能达到的谐波数高得多的谐波数。这表明混合性能受益于同步操作，这也导致动态范围的改善。我们相信，集成更多数量的锁相结可以进一步提高混频器的性能。未来的研究应调查的效果，更多的结上的混频器性能，以及曲折长度的效果。
Josephson devices have demonstrated the capability to work as harmonic mixers at terahertz frequencies. Low temperature devices, in particular Nb–Nb point contacts have proven particularly successful. However, practical applications of these devices have been limited by the need of utilizing liquid helium. To overcome this limitation we have investigated the use of high-Tc devices. In this paper, we report mixings up to the 154th harmonic at zero-bias in a series of YBa2Cu3O7−δ (YBCO) grain boundary Josephson junctions. We have integrated a meander series of three bicrystal YBCO Josephson junctions with a log-periodic antenna. When properly operated, this configuration allows to reach a harmonic number much higher than what possible with a single junction. This shows that the mixing performance benefits from the synchronous operation which also results in an improvement of dynamic range. We believe that the integration of a higher number of phase-locked junctions may further improve the mixer’s performance. Future studies should investigate the effect of higher number of junctions on the mixer performances, as well as the effect of the meander length.