TY  - JOUR
AU  - Schwaab, G. W.
AU  - Sirmain, G.
AU  - Schubert, J.
AU  - Hubers, H-W
AU  - Gol'tsman, G.
AU  - Cherednichenko, S.
AU  - Verevkin, A.
AU  - Voronov, B.
AU  - Gershenzon, E.
PY  - 1999
DA  - 1999//
TI  - Investigation of NbN phonon-cooled HEB mixers at 2.5 THz
T2  - IEEE Trans. Appl. Supercond.
JO  - IEEE Trans. Appl. Supercond.
SP  - 4233
EP  - 4236
VL  - 9
IS  - 2
KW  - NbN HEB mixers
AB  - The development of superconducting hot electron bolometric (HEB) mixers has been a big step forward in the direction of quantum noise limited mixer performance at THz frequencies. Such mixers are crucial for the upcoming generation of airborne and spaceborne THz heterodyne receivers. In this paper we report on new results on a phonon-cooled NbN HEB mixer using e-beam lithography. The superconducting film is 3 nm thick. The mixer is 0.2 μm long and 1.5 μm wide and it is integrated in a spiral antenna on a Si substrate. The device is quasi-optically coupled through a Si lens and a dielectric beam combiner to the radiation of an optically pumped FIR ring gas laser cavity. The performance of the mixer at different THz frequencies from 0.69 to 2.55 THz with an emphasis on 2.52 THz is demonstrated. At 2.52 THz minimum DSB noise temperatures of 4200 K have been achieved at an IF of 1.5 GHz and a bandwidth of 40 MHz with the mixer mounted in a cryostat and a 0.8 m long signal path in air.
SN  - 1051-8223
UR  - https://ieeexplore.ieee.org/document/783959
UR  - https://doi.org/10.1109/77.783959
DO  - 10.1109/77.783959
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=550), last updated on Tue, 25 May 2021 12:23:38 -0500
ID  - Schwaab_etal1999
ER  -