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Springer eBooks

High Frequency Properties and Applications of Josephson Junctions from Microwaves to Far-Infrared

Robert Adde, G. Vernet

Published Jan 1, 1977• 7 citations
Publisher
DOI
10.1007/978-1-4684-2805-6_6

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Point-contact-type Josephson junctions have been developed as a harmonic mixer to measure far-infrared (FIR) laser frequencies in a frequency chain up to the infrared region. The junctions were formed by mechanically pressing a niobium wire of 70 μm in diameter with a sharply etched tip against a niobium post of 2 mm in diameter. The voltage-current characteristics of the mixers were investigated under the irradiation of FIR lights from an optically pumped methyl-alcohol laser. The Shapiro steps for FIR lights up to 3.1 THz were observed. The mixing properties of the mixers were studied through harmonic mixing experiments of 50-GHz microwaves and the FIR lights up to the frequency of 3.1 THz. The conversion efficiency of the beat signals to the incident FIR power was found to vary as the — 4th power of the FIR frequency. From the mixing properties, the combination of the critical current Icof the junction and the product IcRnwhere Rnis the normal resistance of the junction, was found important to optimize the mixing performance.

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1 Introduction Compared with its semiconductor counterpart, Josephson junction (J. J.) usually has larger nonlinearity, lower noise temperature, wider operating waveband and less microwave loss, thus making itself a good candidate for applications at submillimeter and far-infrared wavebands. Some harmonic mixing experiments were done previously using N_b point-contact junctions, with the highest signal frequency being about 4.25 THz and the largest harmonic number being 851. However, because of the requirement of liquid

Chinese Science Bulletin•Sep 15, 1993•2 citations
Point-contact-type Josephson junctions have been developed as a harmonic mixer to measure far-infrared (FIR) laser frequencies in a frequency chain up to the infrared region. The junctions were formed by mechanically pressing a niobium wire of 70 μm in diameter with a sharply etched tip against a niobium post of 2 mm in diameter. The voltage-current characteristics of the mixers were investigated under the irradiation of FIR lights from an optically pumped methyl-alcohol laser. The Shapiro steps for FIR lights up to 3.1 THz were observed. The mixing properties of the mixers were studied through harmonic mixing experiments of 50-GHz microwaves and the FIR lights up to the frequency of 3.1 THz. The conversion efficiency of the beat signals to the incident FIR power was found to vary as the — 4th power of the FIR frequency. From the mixing properties, the combination of the critical current Icof the junction and the product IcRnwhere Rnis the normal resistance of the junction, was found important to optimize the mixing performance.
1 Introduction Compared with its semiconductor counterpart, Josephson junction (J. J.) usually has larger nonlinearity, lower noise temperature, wider operating waveband and less microwave loss, thus making itself a good candidate for applications at submillimeter and far-infrared wavebands. Some harmonic mixing experiments were done previously using N_b point-contact junctions, with the highest signal frequency being about 4.25 THz and the largest harmonic number being 851. However, because of the requirement of liquid