%0 Journal Article
%T Superconducting hot-electron-bolometer mixers for the mid-IR
%A Pentin, Ivan
%A Finkel, Matvey
%A Maslennikov, Sergey
%A Vakhtomin, Yuri
%A Smirnov, Konstantin
%A Kaurova, Nataliya
%A Goltsman, Gregory
%J Rus. J. Radio Electron.
%D 2017
%N 10
%@ 1684-1719
%G Russian
%F Pentin_etal2017
%O http://jre.cplire.ru/jre/oct17/9/abstract.html (Russian) Гетеродинный приемник со сверхпроводниковым смесителем на эффекте электронного разогрева для среднего инфракрасного диапазона
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1747), last updated on Sun, 04 Jul 2021 16:42:11 -0500
%X The work presents the result of development of the NbN superconducting hot-electron-bolometer (HEB) mixer. The sensitive element of the mixer is directly coupled to mid-IR radiation, and doesn’t have planar metallic antenna. Investigations of noise characteristics of NbN HEB mixer were performed at the frequency 28.4 THz (λ = 10.6 µm) by using gas-discharge CW CO2-laser without consideration of optical and electrical losses in the heterodyne receiver. The noise temperature of NbN HEB mixer with the size of the sensitive element 10 µm × 10 µm was 2320 K (~ 1.5hν/kB) at the heterodyne frequency of 28.4 THz. The noise temperature was determined by measuring the Y-factor taking into account the term which describes fluctuations of zero-point oscillations in accordance with the fluctuation-dissipation theorem of Calle-Welton. Isothermal method was used to estimate the absorbed heterodyne radiation power which was 9 µW at the optimal operating point for the minimum noise temperature of NbN HEB mixer.
%K IR NbN HEB mixers
%U http://jre.cplire.ru/jre/oct17/9/abstract_e.html