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Chinese Physics Letters

Terahertz Detection with Twin Superconductor-Insulator-Superconductor Tunnel Junctions

Jing Li, 王明杰, 史生才, 松尾宏

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

有成双的 superconductor-insulator-superconductor (SIS ) 的兆兆赫察觉隧道连接，经由一根引入的薄电影的 superconductingmicrostrip 线在平行被连接，主要被学习。第一，我们借助于一个 Fourier 变换分光计调查 asuperconducting 双胞胎连接设备的直接察觉的反应。第二， weconstruct 成双的 SIS 隧道连接的一个直接察觉的模型。超导的成双的 junctiondevice 然后以构造模型被模仿。模拟结果被发现是对测量那个的 ingood 同意。另外，我们观察到直接察觉的反应 ofthe 设备与噪音温度行为一致。

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有成双的 superconductor-insulator-superconductor (SIS ) 的兆兆赫察觉隧道连接，经由一根引入的薄电影的 superconductingmicrostrip 线在平行被连接，主要被学习。第一，我们借助于一个 Fourier 变换分光计调查 asuperconducting 双胞胎连接设备的直接察觉的反应。第二， weconstruct 成双的 SIS 隧道连接的一个直接察觉的模型。超导的成双的 junctiondevice 然后以构造模型被模仿。模拟结果被发现是对测量那个的 ingood 同意。另外，我们观察到直接察觉的反应 ofthe 设备与噪音温度行为一致。
Terahertz detection with twin superconductor–insulator–superconductor (SIS) tunnel junctions, which are connected in parallel via an inductive thin-film superconducting microstrip line, is mainly studied. Firstly, we investigate the direct-detection response of a superconducting twin-junction device by means of a Fourier transform spectrometer. Secondly, we construct a direct-detection model of twin SIS tunnel junctions. The superconducting twin-junction device is then simulated in terms of the constructed model. The simulation result is found to be in good agreement with the measured one. In addition, we observe that the direct-detection response of the device is consistent with the noise temperature behaviour.
The terahertz band, a unique segment of the electromagnetic spectrum, is crucial for observing the cold, dark universe and plays a pivotal role in cutting-edge scientific research, including the study of cosmic environments that support life and imaging black holes. High-sensitivity superconductor–insulator–superconductor (SIS) mixers are essential detectors for terahertz astronomical telescopes and interferometric arrays. Compared to the commonly used classical Nb/AlO x /Nb superconducting tunnel junction, the Nb/AlN/NbN hybrid superconducting tunnel junction has a higher energy gap voltage and can achieve a higher critical current density. This makes it particularly promising for the development of ultra-wideband, high-sensitivity coherent detectors or mixers in various scientific research fields. In this paper, we present a superconducting SIS mixer based on Nb/AlN/NbN parallel-connected twin junctions (PCTJ), which has a bandwidth extending up to 490 GHz–720 GHz. The best achieved double-sideband (DSB) noise temperature (sensitivity) is below three times the quantum noise level.
With a gap frequency of 1.4 THz, all-NbN Superconductor-Insulator-Superconductor (SIS) junctions are potentially applicable to sensitive heterodyne mixers for THz astronomy and atmospheric research. In this paper, we report the design, fabrication, and performance characterization of a 0.5-THz waveguide SIS mixer incorporating twin NbN/AlN/NbN junctions and an NbN/MgO/NbN tuning circuit with no impedance transformers. The noise performance of two NbN SIS junctions with different tuning inductances is measured, compared with the simulated results without and with the multiple Andreev reflection (MAR) effect taken into account, and also compared with the video detection response. In addition, the IF-output-power stability and aging effect of fabricated NbN SIS junctions are investigated.
Superconductor-Insulator-Superconductor (SIS) mixers are currently the most widely used detectors in astronomical observations in the terahertz band. To meet the demands of future large-aperture terahertz radio telescopes for multipixel applications, this work focused on the integration technology of a 660 GHz 1×4 one-dimensional linear array SIS mixers. The SIS mixers based on Nb/AlN/NbN twin tunnel junctions. We developed the uniform distribution of local oscillator power by using an integrated waveguide and multi-path local oscillator power distribution network. We also integrated the passive frequency doubler and tripler at low temperature, and integrated four low-noise amplifiers with the mixer in the same block, resulting in a more compact structure. As a result, we successfully realized the simultaneous operation of four mixers in a cryogenic Dewar. This paper will provide a detailed description of the relevant design and testing results.