Abstract
A high-quality superconducting resonator with a microbridge of hafnium film for use in a circuit for readout a terahertz-band imaging array with frequency division multiplexing is demonstrated experimentally. The variability of the impedance of the bridge at a frequency of 1.5 GHz, which is a key factor in the control of the quality of the resonator, is studied. The bridge, having a thickness of about 50 nm, a critical temperature TC ≈ 380 mK, and a plan size of 2.5 × 2.5 μm, was connected as a load of a resonator made of niobium film with a thickness of about 100 nm (TC ~ 9 K). It is shown that the bridge smoothly changes its impedance proportionally to the bias power in the entire temperature range. The effective thermal insulation of the bridge was measured in a dilution cryostat at temperatures of 50–300 mK. Thermal conductivity G of the bridge was calculated and found to be ~4 × 10–13 W/K, which gives an estimate of the sensitivity of the structure in the bolometric mode NEP ≈ 8 × 10–19 W/Hz1/2 at a temperature of 150 mK.
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Original Russian Text © A.V. Merenkov, S.V. Shitov, V.I. Chichkov, A.B. Ermakov, T.M. Kim, A.V. Ustinov, 2018, published in Pis’ma v Zhurnal Tekhnicheskoi Fiziki, 2018, Vol. 44, No. 13, pp. 59–67.
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Merenkov, A.V., Shitov, S.V., Chichkov, V.I. et al. A Superconducting Resonator with a Hafnium Microbridge at Temperatures of 50–350 mK. Tech. Phys. Lett. 44, 581–584 (2018). https://doi.org/10.1134/S106378501807012X
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DOI: https://doi.org/10.1134/S106378501807012X