Mixing at terahertz frequency band using YBa2Cu3O7−δ bicrystal Josephson junctions
Mixing at terahertz frequency band using YBa2Cu3O7−δ bicrystal Josephson junctions
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DOI：
10.1063/1.119836
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发表时间：
1997-08
影响因子：
4
通讯作者：
Jian Chen;H. Myoren;K. Nakajima;T. Yamashita;P. Wu
中科院分区：
文献类型：
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作者：
Jian Chen;H. Myoren;K. Nakajima;T. Yamashita;P. Wu
利用YBa 2Cu 3 O 7 −δ在MgO双晶界面上形成的高Tc约瑟夫森结，在太赫兹（THz）频段，我们演示了基波和谐波混频。来自远红外激光器的辐射通过扩展的超半球硅透镜耦合到与平面蝴蝶结天线集成的结。基本混合表现在结的直流电流-电压（I-V）曲线作为第三夏皮罗步骤，除了这两个引起的太赫兹激光线从一个稍微失调的谐振器。在太赫兹激光与微波本振的谐波混频中，我们可以得到的最高谐波数为490，在中频的信噪比为9 dB。
Using high-Tc Josephson junctions made of YBa2Cu3O7−δ deposited across MgO bicrystal boundary, at terahertz (THz) frequency band, we demonstrated both fundamental and harmonic mixing. Radiation from a far-infrared laser was coupled to the junction, which was integrated with a planar bow-tie antenna, via an extended hyperhemispherical silicon lens. Fundamental mixing manifested itself in the junction’s dc current–voltage (I–V) curve as a third Shapiro step in addition to those two induced by the THz laser lines from a slightly misaligned resonator. In harmonic mixing between a THz laser line and a microwave local oscillator, the highest harmonic number we could get was 490 with a signal-to-noise ratio of 9 dB at the intermediate frequency.