%0 Journal Article
%T Spiral antenna NbN hot-electron bolometer mixer at submm frequencies
%A Svechnikov, S.
%A Gol'tsman, G.
%A Voronov, B.
%A Yagoubov, P.
%A Cherednichenko, S.
%A Gershenzon, E.
%A Belitsky, V.
%A Ekstrom, H.
%A Kollberg, E.
%A Semenov, A.
%A Gousev, Y.
%A Renk, K.
%J IEEE Trans. Appl. Supercond.
%D 1997
%V 7
%N 2
%@ 1051-8223
%F Svechnikov_etal1997
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1597), last updated on Tue, 25 May 2021 21:46:53 -0500
%X We have studied the phonon-cooled hot-electron bolometer (HEB) as a quasioptical mixer based on a spiral antenna designed for the 0.3-1 THz frequency band and fabricated on sapphire and high resistivity silicon substrates. HEB devices were produced from superconducting 3.5-5 nm thick NbN films with a critical temperature 10-12 K and a critical current density of approximately 10/sup 7/ A/cm/sup 2/ at 4.2 K. For these devices we reached a DSB receiver noise temperature below 1500 K, a total conversion loss of L/sub t/=16 dB in the 500-700 GHz frequency range, an IF bandwidth of 3-4 GHz and an optimal LO absorbed power of /spl sime/4 /spl mu/W. We experimentally analyzed various contributions to the conversion loss and obtained an RF coupling factor of about 5 dB, internal mixer loss of 10 dB and IF mismatch of 1 dB.
%K NbN HEB mixers
%R 10.1109/77.622105
%U http://ieeexplore.ieee.org/document/622105/
%U https://doi.org/10.1109/77.622105
%P 3395-3398