Terahertz Josephson spectral analysis and its applications

Snezhko, A. V.; Lyatti, M. V.; Poppe, U.; Divin, Yuri; Gundareva, Irina; Volkov, O. Y.; Pavlovskiy, V. V.

doi:10.1088/1361-6668/aa5ab5

Journal Article

FZJ-2017-03024

Terahertz Josephson spectral analysis and its applications

Snezhko, A. V. ; Gundareva, I.FZJ* ; Lyatti, M. V. ; Volkov, O. Y. ; Pavlovskiy, V. V. ; Poppe, U.FZJ* ; Divin, Y. (Corresponding author)FZJ*

2017
IOP Publ. Bristol

Superconductor science and technology 30(4), 044001 - (2017) [10.1088/1361-6668/aa5ab5]

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Please use a persistent id in citations: doi:10.1088/1361-6668/aa5ab5

Abstract: Principles of Hilbert-transform spectral analysis (HTSA) are presented and advantages of the technique in the terahertz (THz) frequency range are discussed. THz HTSA requires Josephson junctions with high values of characteristic voltages I c R n and dynamics described by a simple resistively shunted junction (RSJ) model. To meet these requirements, [001]- and [100]-tilt YBa2Cu3O7−x bicrystal junctions with deviations from the RSJ model less than 1% have been developed. Demonstrators of Hilbert-transform spectrum analyzers with various cryogenic environments, including integration into Stirling coolers, are described. Spectrum analyzers have been characterized in the spectral range from 50 GHz to 3 THz. Inside a power dynamic range of five orders, an instrumental function of the analyzers has been found to have a Lorentz form around a single frequency of 1.48 THz with a spectral resolution as low as 0.9 GHz. Spectra of THz radiation from optically pumped gas lasers and semiconductor frequency multipliers have been studied with these spectrum analyzers and the regimes of these radiation sources were optimized for a single-frequency operation. Future applications of HTSA will be related with quick and precise spectral characterization of new radiation sources and identification of substances in the THz frequency range.

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