Investigation of Frequency Tunable Superconducting Submillimeter Oscillator

频率可调谐超导亚毫米振荡器的研究

• 批准号: 01550035
• 负责人: SAKAI Kiyomi
• 金额: $ 1.15万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550035/
• 关键词: Flux-flow Oscillator; Superconducting Oscillator; Tunable Oscillator; Submillimeter Oscillator; Velocity Matching step

As a candidate for compact submillimeter oscillators, we have fabricated the flux-flow oscillator (FFO) connected with a bow-tie antenna through a microstrip quarter-wavelength impedance transformer. The Nb/A10_x/Nb tunnel junction technology has been used for the fabrication of the device. In the term of project, we have fabricated two types ; FFO Ver. 1 and FFO Ver. 2. Each device is fabricated on a crystalline quartz substrate in a cell of 4mm squares. The Ver. 1 is more integrated than the Ver. 2. The Ver. 1 is composed of four parts : two long Josephson junctions, two microstrip transformers, a bow-tie antenna and a monitor SIS (Superconductor Insulator Superconductor) detector. Current circuits to generate the magnetic flux along the long Josephson junctions are also integrated in Ver. 1. The Ver. 2 is composed of a long Josephson junction, a microstrip transformer and a bow-tie antenna. The magnetic flux is generated by use of an external magnet.Experiments were done immersing e … More ach element in liquid helium (4.2 K). Velocity-matching steps were observed in both versions in the course of static current-voltage measurements. The oscillation power was monitored by means of PAT (Photon-Assisted-Tunnelling) detection mode of the SIS in Ver. 1. The oscillation frequency calculated based on the voltage where the velocity-matching step stands coincides well with the frequency obtained from the PAT step. The oscillation was confirmed in the frequency range between 160 GHz and 310GHz. In Ver. 2 the oscillation power was radiated from the bow-tie antenna into the free space collimated with a hyper-hemispherical lens. The radiated power was focused by a metallic cone onto a calibrated InSb hot electron bolometer. The oscillation was confirmed over the range of 140GHz-490GHz. The oscillation power of -1 muW was obtained at maximum in the tested devices. This power level is not so scarce for practical applications. In order to push up this device to the practical application level, measurements of oscillation line width and the stabilization of oscillation frequency have to be continued. Less

作为紧凑型亚毫米波振荡器的候选方案，我们制作了通过微带四分之一波长阻抗Transformer与蝶形天线连接的磁通流振荡器（FFO）。该器件采用了Nb/A10_x/Nb隧道结技术。在项目期间，我们制作了两种类型：FFO版本。1和FFO版本2.每个器件都是在4平方毫米的单元中的晶体石英衬底上制造的。的版本。1比Ver更完整。2.的版本。1由四个部分组成：两个长约瑟夫森结，两个微带变压器，一个蝴蝶结天线和一个监控SIS（超导绝缘体超导体）检测器。电流电路产生的磁通量沿着长约瑟夫森结也集成在版本。1.的版本。2是由一个长约瑟夫森结、一个微带Transformer和一个蝶形天线组成。磁通量是通过使用外部磁铁产生的。 ...更多信息 液氦（4.2 K）中的每种元素。在静态电流-电压测量的过程中，在两个版本中观察到速度匹配步骤。振荡功率通过Ver. 1.基于速度匹配步骤所处的电压计算的振荡频率与从PAT步骤获得的频率很好地一致。在160 ~ 310 GHz的频率范围内，证实了该振荡现象。在Ver. 2振荡功率从蝴蝶结天线辐射到用超半球形透镜准直的自由空间中。用金属锥将辐射功率聚焦到已校准的InSb热电子测辐射热计上。在140 GHz-490 GHz范围内证实了振荡。在所测试的器件中，最大获得了-1 μ W的振荡功率。这个功率水平对于实际应用来说并不稀缺。为了使该器件达到实际应用水平，必须继续进行振荡线宽的测量和振荡频率的稳定。少