%0 Journal Article
%T Noise temperature and local oscillator power requirement of NbN phonon-cooled hot electron bolometric mixers at terahertz frequencies
%A Yagoubov, P.
%A Kroug, M.
%A Merkel, H.
%A Kollberg, E.
%A Gol'tsman, G.
%A Svechnikov, S.
%A Gershenzon, E.
%J Appl. Phys. Lett.
%D 1998
%V 73
%N 19
%F Yagoubov_etal1998
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=911), last updated on Tue, 25 May 2021 17:15:08 -0500
%X In this letter, the noise performance of NbN-based phonon-cooled hot electron bolometric quasioptical mixers is investigated in the 0.55–1.1 THz frequency range. The best results of the double-sideband <cd><2018>DSB<cd><2019> noise temperature are: 500 K at 640 GHz, 600 K at 750 GHz, 850 K at 910 GHz, and 1250 K at 1.1 THz. The water vapor in the signal path causes significant contribution to the measured receiver noise temperature around 1.1 THz. The devices are made from 3-nm-thick NbN film on high-resistivity Si and integrated with a planar spiral antenna on the same substrate. The in-plane dimensions of the bolometer strip are typically 0.2Ï«2 um. The amount of local oscillator power absorbed in the bolometer is less than 100 nW.
%K NbN HEB mixers
%K noise temperature
%K local oscillator power
%R 10.1063/1.122599
%U https://aip.scitation.org/doi/abs/10.1063/1.122599
%U https://doi.org/10.1063/1.122599
%P 2814-2816