TY  - JOUR
AU  - Tret'yakov, I. V.
AU  - Kaurova, N. S.
AU  - Voronov, B. M.
AU  - Anfert'ev, V. A.
AU  - Revin, L. S.
AU  - Vaks, V. L.
AU  - Gol'tsman, G. N.
PY  - 2016
DA  - 2016//
TI  - The influence of the diffusion cooling on the noise band of the superconductor NbN hot-electron bolometer operating in the terahertz range
JO  - Tech. Phys. Lett.
SP  - 563
EP  - 566
VL  - 42
IS  - 6
KW  - HEB
KW  - noise bandwidth
KW  - conversion gain bandwidth
KW  - noise temperature
KW  - Andreev reflection
AB  - Results of an experimental study of the noise temperature (Tn) and noise bandwidth (NBW) of the superconductor NbN hot-electron bolometer (HEB) mixer as a function of its temperature (Tb) are presented. It was determined that the NBW of the mixer is significantly wider at temperatures close to the critical ones (Tc) than are values measured at 4.2 K. The NBW of the mixer measured at the heterodyne frequency of 2.5 THz at temperature Tb close to Tc was ~13 GHz, as compared with 6 GHz at Tb = 4.2 K. This experiment clearly demonstrates the limitation of the thermal flow from the NbN bridge at Tb â‰<aa> Tc for mixers manufactured by the in situ technique. This limitation is close in its nature to the Andreev reflection on the superconductor/ metal boundary. In this case, the noise temperature of the studied mixer increased from 1100 to 3800 K.
UR  - https://doi.org/10.1134/S1063785016060146
DO  - 10.1134/S1063785016060146
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1106), last updated on Sun, 02 Oct 2016 11:12:30 -0500
ID  - Tretyakov_etal2016
ER  -