Investigation of signal coupling circuit for NbN-based SIS mixer operated at 650 GHz

IF 3.1 3区物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION

Infrared Physics & Technology Pub Date : 2024-09-15 DOI:10.1016/j.infrared.2024.105560

Lianhao He, Fangting Lin, Xiaoyong He

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引用次数: 0

Abstract

Superconductor-insulator-superconductor (SIS) mixers are the most sensitive coherent detectors in the terahertz region and are extensively utilized in astronomical research and atmospheric observation. In order to improve the detection accuracy of frequency, reduce the loss of signal in the transmission path, and reduce noise temperature, it is important to design a signal coupling circuit with high coupling efficiency. In this paper, with the help of a high-frequency structure simulator, a signal coupling circuit was designed based on a waveguide NbN-based SIS mixer at 650 GHz. The return loss and embedding impedance of this SIS mixer were investigated from 600 to 720 GHz. The effects of the SIS mixer chip’s bow-tie probe angle, substrate thickness, and chip slot height were calculated and analyzed. The results show that the return loss is lower than -16 dB in the 600 to 720 GHz band, and the embedding impedance is around 60 Ω, which can provide a good reference for the development of waveguide SIS mixers.

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基于氮化铌的 SIS 混频器在 650 千兆赫频率下工作的信号耦合电路研究

超导体-绝缘体-超导体（SIS）混频器是太赫兹区域最灵敏的相干探测器，被广泛应用于天文研究和大气观测。为了提高频率的探测精度，减少信号在传输路径上的损耗，降低噪声温度，设计一种具有高耦合效率的信号耦合电路非常重要。本文借助高频结构模拟器，设计了一种基于波导氮化铌基 SIS 混频器的信号耦合电路，频率为 650 GHz。研究了该 SIS 混频器在 600 至 720 GHz 频率范围内的回波损耗和嵌入阻抗。计算并分析了 SIS 混频器芯片的弓形探针角度、衬底厚度和芯片槽高度的影响。结果表明，在 600 至 720 GHz 频段内，回波损耗低于 -16 dB，嵌入阻抗约为 60 Ω，可为波导 SIS 混频器的开发提供良好的参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Infrared Physics & Technology 物理-光学

CiteScore

5.70

自引率

12.10%

发文量

400

审稿时长

67 days

期刊介绍： The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.