%0 Journal Article
%T Terahertz-frequency waveguide NbN hot-electron bolometer mixer
%A Kawamura, J.
%A Tong, C-Y E.
%A Blundell, R.
%A Papa, D. C.
%A Hunter, T. R.
%A Patt, F.
%A Gol’tsman, G.
%A Gershenzon, E.
%J IEEE Trans. Appl. Supercond.
%D 2001
%V 11
%N 1
%@ 1558-2515
%F Kawamura_etal2001
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1546), last updated on Mon, 24 May 2021 14:01:46 -0500
%X We have developed a low-noise waveguide heterodyne receiver for operation near 1 THz using phonon-cooled NbN hot-electron bolometers. The mixer elements are submicron-sized microbridges of 4 nm-thick NbN film fabricated on a quartz substrate. Operating at a bath temperature of 4.2 K, the double-sideband receiver noise temperature is 760 K at 1.02 THz and 1100 K at 1.26 THz. The local oscillator is provided by solid-state sources, and power measured at the source is less than 1 /spl mu/W. The intermediate frequency bandwidth exceeds 2 GHz. The receiver was used to make the first ground-based heterodyne detection of a celestial spectroscopic line above 1 THz.
%K NbN HEB mixers
%R 10.1109/77.919505
%U https://doi.org/10.1109/77.919505
%P 952-954