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- Title
Experimental Study of the Reflectivity of Superconducting Nb-Based Films in the Subterahertz Frequency Band.
- Authors
Gunbina, A. A.; Serov, E. A.; Mineev, K. V.; Parshin, V. V.; Vdovin, V. F.; Chekushkin, A. M.; Khan, F. V.; Koshelets, V. P.
- Abstract
We present the results of studying the reflectivity of thin Nb and NbTiN films deposited on silicon substrates in the frequency range 205–255 GHz at temperatures from 5 K to room temperature. The experiment was performed using a resonator spectrometer, in which the studied specimen is a mirror in the high-Q Fabry–Perot resonator. The comparison of the obtained results with earlier works shows that the reflection losses for Nb in the superconducting state is several times lower than those for the high-temperature superconductor YBa2Cu3O7−δ and lower than those for the samples of high-purity copper cooled down to cryogenic temperatures, which is the best of the classical conductors in terms of surface resistance. This allows one to state that niobium and its nitrides cooled down to temperatures below 9 K can be used efficiently as antenna materials (both as coatings on mirror antennas and for manufacture of planar nanoantennas of the detector module) in order to ensure the minimum level of thermal noise in subterahertz radio telescopes with cooled and superconducting receivers.
- Subjects
SUPERCONDUCTING films; HIGH temperature superconductors; FABRY-Perot resonators; SURFACE resistance; RADIO telescopes; THERMAL noise
- Publication
Radiophysics & Quantum Electronics, 2022, Vol 65, Issue 5/6, p471
- ISSN
0033-8443
- Publication type
Article
- DOI
10.1007/s11141-023-10229-z