Pimanov Dmitrii A, Frost Vladimir A, Blagodatkin Anton V, Gordeeva Anna V, Pankratov Andrey L, Kuzmin Leonid S
Nizhny Novgorod State Technical University, Nizhny Novgorod, Minin Street, 24, 603950, Russia.
Chalmers University of Technology, Department of Microtechnology and Nanoscience - MC2, Gothenburg, SE-412 96, Sweden.
Beilstein J Nanotechnol. 2022 Sep 7;13:896-901. doi: 10.3762/bjnano.13.80. eCollection 2022.
Electron on-chip cooling from the base temperature of 300 mK is very important for highly sensitive detectors operating in space due to problems of dilution fridges at low gravity. Electron cooling is also important for ground-based telescopes equipped with He cryostats being able to function at any operating angle. This work is aimed at the investigation of electron cooling in the low-temperature range. New samples of cold-electron bolometers with traps and hybrid superconducting/ferromagnetic absorbers have shown a temperature reduction of the electrons in the refrigerator junctions from 300 to 82 mK, from 200 to 33 mK, and from 100 to 25 mK in the idle regime without optical power load. The electron temperature was determined by solving heat balance equations with account of the leakage current, sixth power of temperature in the whole temperature range, and the Andreev current using numerical methods and an automatic fit algorithm.
由于低重力环境下稀释制冷机存在问题，对于在太空中运行的高灵敏度探测器而言，将电子芯片从300 mK的基础温度冷却下来非常重要。电子冷却对于配备氦低温恒温器且能够在任何工作角度运行的地面望远镜也很重要。这项工作旨在研究低温范围内的电子冷却。带有陷阱以及混合超导/铁磁吸收器的新型冷电子测辐射热计样品显示，在无光功率负载的空闲状态下，制冷结中的电子温度从300 mK降至82 mK，从200 mK降至33 mK，从100 mK降至25 mK。通过考虑漏电流、整个温度范围内温度的六次方以及安德烈夫电流，使用数值方法和自动拟合算法求解热平衡方程来确定电子温度。
