Noise and Bandwidth of 0.5-THz Twin Vertically Stacked SIS Junctions

Noise and Bandwidth of 0.5-THz Twin Vertically Stacked SIS Junctions
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0.5-THz 双垂直堆叠 SIS 结的噪声和带宽

DOI:
10.1109/tasc.2010.2096493
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发表时间:
2011-06
期刊:
IEEE Trans. Appl. Supercond.
影响因子:
--
通讯作者:
ChuangPing Chiu
ChuangPing Chiu
中科院分区:
其他
文献类型:
--
作者:
Jing Li;Hsian-Hong Chang;Sheng-Cai Shi;Dong Liu;Kang-Ming Zhou;MingJye Wang;Tse-Jun Chen;Chong-Wen Chen;Wei-Chun Lu;ChuangPing Chiu

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超导体-绝缘体-超导体(SIS)结具有结构简单、带宽大、噪声温度低等优点,在毫米波和亚毫米波外差混频器中得到了广泛的应用。然而,随着频率的增加,连接两个单独的SIS结的调谐电感的长度变短,而结面积保持固定。在相对短的调谐电感的情况下,结的扩散电感的影响变得不可忽略,并且器件制造变得更加困难。通过采用垂直堆叠的SIS结(VSJ),其具有与结数成反比的等效几何电容,增加结调谐电感变得可行。在本文中,我们报告的设计,制造和表征的双Nb/Al-AlOx/Nb/Al-AlOx/Nb VSJ的500 GHz的频带。
Twin SIS (superconductor-insulator-superconductor) junctions, with a simple structure, yet large bandwidth and low noise temperature, have been widely used in millimeter- and submillimeter-wave heterodyne mixers. With increasing frequency, however, the length of the tuning inductance connecting the two individual SIS junctions becomes short while the junction area remains fixed. With a relatively short tuning inductance, the effect of the junction's spreading inductance becomes non-negligible, and device fabrication becomes more difficult. By adopting vertically stacked SIS junctions (VSJs), which have an equivalent geometric capacitance inversely proportional to the junction number, it becomes feasible to increase the junction tuning inductance. In this paper, we report on the design, fabrication, and characterization of twin Nb/Al-AlOx/Nb/Al-AlOx/Nb VSJs for the 500-GHz frequency band.
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