TY  - CONF
AU  - Zhang, W.
AU  - Li, N.
AU  - Jiang, L.
AU  - Ren, Y.
AU  - Yao, Q-J
AU  - Lin, Z-H
AU  - Shi, S-C
AU  - Voronov, B. M.
AU  - Gol’tsman, G. N.
A2  - Terahertz Photonics
ED  - Zhang, C.
ED  - Zhang, X-C
PY  - 2008
DA  - 2008//
TI  - Dependence of noise temperature of quasi-optical superconducting hot-electron bolometer mixers on bath temperature and optical-axis displacement
T2  - Proc. SPIE
BT  - Proc. SPIE
SP  - 684007 (1 to 8)
VL  - 6840
PB  - Spie
KW  - NbN HEB mixers
KW  - noise temperature
KW  - LO power
AB  - It is known that the increase of bath temperature results in the decrease of critical current of superconducting hot-electron bolometer (HEB) mixers owing to the depression of superconductivity, thus leading to the degradation of the mixer’s sensitivity. Here we report our study on the effect of bath temperature on the heterodyne mixing performance of quasi-optical superconducting NbN HEB mixers incorporated with a two-arm log-spiral antenna. The correlation between the bath temperature, critical current, LO power requirement and noise temperature is investigated at 0.5 THz. Furthermore, the heterodyne mixing performance of quasi-optical superconducting NbN HEB mixers is examined while there is an optical-axis displacement between the center of the extended hemispherical silicon lens and the superconducting NbN HEB device, which is placed on the back of the lens. Detailed experimental results and analysis are presented.
UR  - https://doi.org/10.1117/12.755238
DO  - 10.1117/12.755238
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1415), last updated on Sat, 15 May 2021 22:57:21 -0500
ID  - Zhang_etal2008
ER  -