Development of waveform observation system with 1ps time resolution and 100 micron specific resolution

开发1ps时间分辨率、100微米特定分辨率的波形观测系统

• 批准号: 02555080
• 负责人: HAYAKAWA Hisao
• 金额: $ 3.97万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555080/
• 关键词: Josephson sampler; Josephson junction; superconducting packaging; 超伝導配線; ストリップライン

The purpose of this study is to develop the waveform observation system with a few picosecond time resolution and a few hundred micron specific resolution. Moreover, microwave propagation properties are analyzed by using the system.(1) [High quality Josephson junctions] It was found that the impurities in the electrodes caused reduction of the superconducting order parameter. We could developed the preparation process of the ideal-like Josephson junctions by increasing the deposition rate of Nb. In addition, the oxidation mechanism was found from the dependence of the critical current density on the oxidation gas pressure.(2) [Waveform observation system] We have developed the waveform observation system with 10ps time resolution and 10muA current sensitivity, which was achieved by reducing the external noise and matching the impedance between Josephson junction circuits and external electronics.(3) [Microwave observation system] We have measured the surface impedance of Nb and AI films by using the system. The experimental results agreed well with the theoretical values based on the BCS theory. The surface resistance of Y-Ba-Cu-0 high Tc superconducting films is under investigation.

本研究的目的是开发具有几皮秒时间分辨率和几百微米特定分辨率的波形观测系统。并利用该系统对微波传播特性进行了分析。(1)[高质量约瑟夫森结]发现电极中的杂质导致超导有序参数降低。我们可以通过提高Nb的沉积速率来开发理想的约瑟夫森结的制备工艺。此外，从临界电流密度对氧化气体压力的依赖性中发现了氧化机理。(2)[波形观察系统]我们开发了时间分辨率为10ps、电流灵敏度为10μA的波形观察系统，该系统通过以下方法实现： (3)[微波观测系统]利用该系统测量了Nb和AI薄膜的表面阻抗。实验结果与基于BCS理论的理论值吻合良好。 Y-Ba-Cu-0高Tc超导薄膜的表面电阻正在研究中。

项目成果

T. Hatou, H. Akaike, A. Fujimaki Y. Takai, H. Hayakawa: "Comparison of Si and InSb as the normal layer of S-N-S junctions." IEEE Trans. Magn., MAG-27. 2585-2588 (1991)

T. Hatou、H. Akaike、A. Fujimaki Y. Takai、H. Hayakawa：“Si 和 InSb 作为 S-N-S 结正常层的比较。”

H.Akaike: "Submicrometer-scale Patterning of Superconducting Nb Films Using Focused Ion Beam." Jpn.J.Appl.Phys.

H.Akaike：“使用聚焦离子束对超导铌薄膜进行亚微米级图案化。”

H. Akaike, A. Fujimaki Y. Takai, H. Hayakawa: "Submicronmeter-scale patterning of superconducting Nb films using focused ion beam." Jpn. J. Appl. Phys.

H. Akaike、A. Fujimaki Y. Takai、H. Hayakawa：“使用聚焦离子束对超导铌薄膜进行亚微米级图案化。”

A.Fujimaki: "Experimental Analysis of Superconducting Properties of YーBaーCuーO/Ag Proximity Interfaces." IEEE Trans.Magn.MAGー27. (1991)

A.Fujimaki：“Y-Ba-Cu-O/Ag 邻近界面超导特性的实验分析。”IEEE Trans.Magn.MAG-27 (1991)。

A.Fujimaki: "Experimental Analysis of Superconducting Properties of Y-Ba-Cu-O/Ag Proximity Interfaces." IEEE Trans Magn.MAG-27. 1353-1356 (1991)

A.Fujimaki：“Y-Ba-Cu-O/Ag 邻近界面超导特性的实验分析”。