%0 Conference Proceedings
%T Noise temperature and absorbed LO power measurement methods for NbN phonon-cooled hot electron bolometric mixers at terahertz frequencies
%A Merkel, H. F.
%A Yagoubov, P. A.
%A Kroug, M.
%A Khosropanah, P.
%A Kollberg, E. L.
%A Gol’tsman, G. N.
%A Gershenzon, E. M.
%S Proc. 28th European Microwave Conf.
%D 1998
%V 1
%F Merkel_etal1998
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1580), last updated on Tue, 25 May 2021 17:21:10 -0500
%X In this paper the absorbed LO power requirements and the noise performance of NbN based phonon-cooled hot electron bolometric (HEB) quasioptical mixers are investigated for RF frequencies in the 0.55-1.1 range The minimal measured DSB noise temperatures are about 500 K at 640 GHz, 600 K at 750 GHz, 850 K at 910 GHz and 1250 K at 1.1 THz. The increase in noise temperature at 1.1THz is attributed to water absorption. The absorbed LO power is measured using a calorimetric approach. The results are subsequently corrected for lattice heating. These values are compared to results of a novel one dimensional hot spot mixer models and to a more traditional isotherm method which tends to underestimate the absorbed LO power for small bias powers. Typically a LO power between 50nW and 100nW is needed to pump the device to the optimal operating point.
%K NbN HEB mixers
%R 10.1109/EUMA.1998.338003
%U https://doi.org/10.1109/EUMA.1998.338003
%P 294-299