TY  - JOUR
AU  - Tretyakov, Ivan
AU  - Ryabchun, Sergey
AU  - Finkel, Matvey
AU  - Maslennikov, Sergey
AU  - Maslennikova, Anna
AU  - Kaurova, Natalia
AU  - Lobastova, Anastasia
AU  - Voronov, Boris
AU  - Gol'tsman, Gregory
PY  - 2011
DA  - 2011//
TI  - Ultrawide noise bandwidth of NbN hot-electron bolometer mixers with in situ gold contacts
JO  - IEEE Trans. Appl. Supercond.
SP  - 620
EP  - 623
VL  - 21
IS  - 3
KW  - NbN HEB mixer bandwidth
AB  - We report a noise bandwidth of 7 GHz in the new generation of NbN hot-electron bolometer (HEB) mixers that are being developed for the space observatory Millimetron. The HEB receiver driven by a 2.5-THz local oscillator offered a noise temperature of 600 K in a 50-MHz final detection bandwidth. As the filter center frequency was swept this value remained nearly constant up to the cutoff frequency of the cryogenic amplifier at 7 GHz. We believe that such a low value of the noise temperature is due to reduced radio frequency (RF) loss at the interface between the superconducting film and the gold contacts. We have also performed gain bandwidth measurements at the superconducting transition on HEB mixers with various lengths and found them to be in excellent agreement with the results of the analytical and numerical models developed for the HEB mixer with both diffusion and phonon cooling of hot electrons.
UR  - https://doi.org/10.1109/TASC.2010.2090634
DO  - 10.1109/TASC.2010.2090634
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=716), last updated on Thu, 13 May 2021 23:49:01 -0500
ID  - Tretyakov_etal2011
ER  -