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Study of Superconducting Transmission Lines and Tunnel Junctions for Signal Detection at Frequencies above 1 THz

  • ON THE 70th ANNIVERSARY OF THE INSTITUTE OF RADIOENGINEERING AND ELECTRONICS, RUSSIAN ACADEMY OF SCIENCES
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Abstract

Superconducting integrated circuits based on NbTiN/Al transmission lines at frequencies of up to 1.1 THz have been developed and experimentally investigated. The numerical simulation has been carried out for two topologies of a microcircuit with an operating frequency range of 0.9‒1.2 THz, which contains a slot antenna formed in the NbTiN thin film and output-matched with a microstrip transmission line and a superconductor‒insulator‒superconductor (SIS) tunnel junction with an area of ~1 µm2 acting as a terahertz detector. Experimental samples of the microcircuit have been fabricated and tested in an experimental setup utilizing a backward-wave oscillator with an output frequency of up to 1.1 THz used as a source. The powerful pumping of the SIS detector has been obtained to demonstrate the applicability of the fabricated NbTiN/Al transmission lines for operation in superconducting circuits at frequencies above 750 GHz, where the conventional Nb/Nb transmission lines cannot operate due to high losses.

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ACKNOWLEDGMENTS

The authors thank A.M. Baryshev for help with numerical calculations. The authors are grateful for the opportunity to access Unique Scientific Unit (USU) no. 352529 Cryointegral, which was used to fabricate the samples and carry out the investigations.

Funding

The development of the technology, fabrication of the samples, and the experiment were supported by the Russian Science Foundation, project no. 23-79-00019, https://rscf.ru/project/23-79-00019/; the numerical calculation was carried out within the framework of the state task at the Kotelnikov Institute of Radioengineering and Electronics, Russian Academy of Sciences; and operation of the Unique Scientific Unit, project no. 352529 “Cryointegral” was supported by the Ministry of Science and Higher Education of the Russian Federation, agreement no. 075-15-2021-667.

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Authors and Affiliations

  1. Kotelnikov Institute of Radioengineering and Electronics, Russian Academy of Sciences, 125009, Moscow, Russia

    N. V. Kinev, A. M. Chekushkin & F. V. Khan

  2. Editorial Board of the Journal “Radiotekhnika i Elektronika”, 125009, Moscow, Russia

    K. I. Rudakov

Authors
  1. N. V. Kinev
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  2. A. M. Chekushkin
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  3. F. V. Khan
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  4. K. I. Rudakov
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Correspondence to N. V. Kinev.

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The authors declare that they have no conflicts of interest.

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Translated by E. Bondareva

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Kinev, N.V., Chekushkin, A.M., Khan, F.V. et al. Study of Superconducting Transmission Lines and Tunnel Junctions for Signal Detection at Frequencies above 1 THz. J. Commun. Technol. Electron. 68, 946–951 (2023). https://doi.org/10.1134/S1064226923090127

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