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

作为紧凑型亚毫米振荡器的候选者，我们通过微带四分之一波长的阻力变压器制造了与弓形天线连接的通量流振荡器（FFO）。 NB/A10_X/NB隧道连接技术已用于制造设备。在项目期间，我们制造了两种类型。 ffo ver。 1和ffo ver。 2。每个设备都在4mm正方形的单元格中的结晶石英底物上制造。 Ver。 1比VER更集成。 2。 1由四个部分组成：两个长的约瑟夫森连接，两个微带变压器，一个弓形式天线和一个监视器SIS（超导体绝缘体超导体）探测器。电流电路沿着长约瑟夫森连接的磁通量产生磁通量也集成在VER中。 1。 2由长的约瑟夫森连接，微带变压器和一个弓形角组成。磁通量是通过使用外部磁体而产生的。进行了浸入E…更多的ACH元素在液体氦（4.2 K）中。在静态电流 - 电压测量过程中，在两个版本中都观察到速度匹配步骤。通过pAT（光子辅助的unnnelling）检测模式监测振荡能力。 1。基于电压计算得出的振荡频率，其中速度匹配步骤与从PAT步骤获得的频率很好地恰逢。在160 GHz和310 GHz之间的频率范围内证实了振荡。在ver。 2从弓形天线辐射到与超半球镜头的自由空间碰撞中。辐射功率通过金属锥将其聚焦到校准的INSB热电子重仪上。在140GHz-490GHz范围内确认了振荡。 -1 MUW的振荡能力在测试设备中最大化。对于实际应用，这种功率水平并不稀缺。为了将该设备推到实际的应用水平，必须继续振荡线宽度和振荡频率的稳定性。较少的