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Author
Semenov, A. D.
;
Hübers, H.–W.
;
Schubert, J.
;
Gol'tsman, G. N.
;
Elantiev, A. I.
;
Voronov, B. M.
;
Gershenzon, E. M.
Title
Frequency dependent noise temperature of the lattice cooled hot-electron terahertz mixer
Type
Conference Article
Year
2000
Publication
Proc. 11
th
Int. Symp. Space Terahertz Technol.
Abbreviated Journal
Proc. 11
th
Int. Symp. Space Terahertz Technol.
Volume
Issue
Pages
39-48
Keywords
NbN HEB mixers
Abstract
We present the measurements and the theoretical model on the frequency dependent noise temperature of a lattice cooled hot electron bolometer (HEB) mixer in the terahertz frequency range. The experimentally observed increase of the noise temperature with frequency is a cumulative effect of the non-uniform distribution of the high frequency current in the bolometer and the charge imbalance, which occurs near the edges of the normal domain and contacts with normal metal. In addition, we present experimental results which show that the noise temperature of a HEB mixer can be reduced by about 30% due to a Parylene antireflection coating on the Silicon hyperhemispheric lens.
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no
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305
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