Abstract
Results of an experimental study of the noise temperature (T n ) and noise bandwidth (NBW) of the superconductor NbN hot-electron bolometer (HEB) mixer as a function of its temperature (T b ) are presented. It was determined that the NBW of the mixer is significantly wider at temperatures close to the critical ones (T c ) than are values measured at 4.2 K. The NBW of the mixer measured at the heterodyne frequency of 2.5 THz at temperature T b close to T c 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 T b ≪ T c 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.
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Original Russian Text © I.V. Tret’yakov, N.S. Kaurova, B.M. Voronov, V.A. Anfert’ev, L.S. Revin, V.L. Vaks, G.N. Gol’tsman, 2016, published in Pis’ma v Zhurnal Tekhnicheskoi Fiziki, 2016, Vol. 42, No. 11, pp. 19–26.
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Tret’yakov, I.V., Kaurova, N.S., Voronov, B.M. et al. The influence of the diffusion cooling on the noise band of the superconductor NbN hot-electron bolometer operating in the terahertz range. Tech. Phys. Lett. 42, 563–566 (2016). https://doi.org/10.1134/S1063785016060146
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DOI: https://doi.org/10.1134/S1063785016060146