Study of Josephson Generation Harmonics in a Long Josephson Junction

IF 0.8 4区地球科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Radiophysics and Quantum Electronics Pub Date : 2023-05-30 DOI:10.1007/s11141-023-10240-4

N. V. Kinev, K. I. Rudakov, L. V. Filippenko, V. P. Koshelets

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Abstract

We present the results of experimental study of the harmonics of Josephson radiation from a terahertz (THz) source based on a long Josephson junction (LJJ). The source consists of an integrated circuit including the LJJ, a matched transmitting antenna, and a harmonic mixer used for phase locking of the output signal. The LJJ and the harmonic mixer are both made of three-layer Nb-AlOx-Nb superconductor–insulator–superconductor (SIS) structures and operate at a temperature of 4.2 K. The antenna is located in the base superconducting Nb electrode of the microcircuit. To study the spectral composition and characteristics of the output radiation, two different methods were employed, using a THz Fourier transform spectrometer based on a broadband semiconductor detector and using a high-resolution THz spectrometer based on a heterodyne SIS receiver. The spectral composition of the radiation demonstrates the presence of both the fundamental harmonic of the Josephson effect and the higher harmonics. The spectral characteristics of the fundamental (at frequencies of 300–335 GHz) and the second (at frequencies of 600–670 GHz) harmonics, respectively, with a spectral resolution of about 0.1 MHz were studied using a SIS detector.

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长约瑟夫森结中约瑟夫森产生谐波的研究

本文介绍了基于长约瑟夫森结(LJJ)的太赫兹(THz)源约瑟夫森辐射谐波的实验研究结果。该源由集成电路组成，包括LJJ、匹配的发射天线和用于输出信号锁相的谐波混频器。LJJ和谐波混频器均由三层Nb-AlOx-Nb超导体-绝缘体-超导体(SIS)结构组成，工作温度为4.2 K。天线位于微电路的超导Nb基电极上。为了研究输出辐射的光谱组成和特性，采用了两种不同的方法，一种是基于宽带半导体探测器的太赫兹傅立叶变换光谱仪，另一种是基于外差SIS接收器的高分辨率太赫兹光谱仪。辐射的光谱组成表明存在约瑟夫森效应的基次谐波和高次谐波。利用SIS探测器分别研究了基频(300-335 GHz)和次频(600-670 GHz)的频谱特性，光谱分辨率约为0.1 MHz。

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来源期刊

Radiophysics and Quantum Electronics ENGINEERING, ELECTRICAL & ELECTRONIC-PHYSICS, APPLIED

CiteScore

1.10

自引率

12.50%

发文量

审稿时长

6-12 weeks

期刊介绍： Radiophysics and Quantum Electronics contains the most recent and best Russian research on topics such as: Radio astronomy; Plasma astrophysics; Ionospheric, atmospheric and oceanic physics; Radiowave propagation; Quantum radiophysics; Pphysics of oscillations and waves; Physics of plasmas; Statistical radiophysics; Electrodynamics; Vacuum and plasma electronics; Acoustics; Solid-state electronics. Radiophysics and Quantum Electronics is a translation of the Russian journal Izvestiya VUZ. Radiofizika, published by the Radiophysical Research Institute and N.I. Lobachevsky State University at Nizhnii Novgorod, Russia. The Russian volume-year is published in English beginning in April. All articles are peer-reviewed.