Open AccessСверхпроводящий резонатор с микромостиком из гафния при температурах 50-350 mK
Author(s) -
А.В. Меренков,
С.В. Шитов,
В.И. Чичков,
А.Б. Ермаков,
Т.М. Ким,
А.В. Устинов
Publication year - 2018
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2018.13.46328.17149
Subject(s) - bolometer , resonator , cryostat , materials science , terahertz radiation , electrical impedance , superconductivity , optoelectronics , thermal conductivity , niobium , electrical engineering , analytical chemistry (journal) , optics , composite material , condensed matter physics , physics , chemistry , engineering , chromatography , detector , metallurgy
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 T _ C ≈ 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 ( T _ C ~ 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/Hz^1/2 at a temperature of 150 mK.