%0 Journal Article
%T Low noise NbN hot electron bolometer mixer at 4.3  THz
%A Khosropanah, P.
%A Gao, J. R.
%A Laauwen, W. M.
%A Hajenius, M.
%A Klapwijk, T. M.
%J Appl. Phys. Lett.
%D 2007
%V 91
%F Khosropanah_etal2007
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=584), last updated on Tue, 25 May 2021 21:54:12 -0500
%X We have studied the sensitivity of a superconducting NbN hot electron bolometer mixer integrated with a spiral antenna at 4.3  THz. Using hot/cold blackbody loads and a beam splitter all in vacuum, we measured a double sideband receiver noise temperature of 1300  K at the optimum local oscillator (LO) power of 330  nW, which is about 12 times the quantum noise (hnu/2kB). Our result indicates that there is no sign of degradation of the mixing process at the superterahertz frequencies. Moreover, a measurement method is introduced which allows us for an accurate determination of the sensitivity despite LO power fluctuations.
%K NbN HEB mixers
%K NbN
%K contacts cleaning
%P 221111 (1 to 3)