TITLE

Doubling of sensitivity and bandwidth in phonon cooled hot electron bolometer mixers

AUTHOR(S)
Baselmans, J.J.A.; Hajenius, M.; Gao, J.R.; Klapwijk, T.M.; de Korte, P.A.J.; Voronov, B.; Gol'tsman, G.
PUB. DATE
March 2004
SOURCE
Applied Physics Letters;3/15/2004, Vol. 84 Issue 11, p1958
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We demonstrate that the performance of NbN lattice cooled hot electron bolometer mixers depends strongly on the interface quality between the bolometer and the contact structure. We show experimentally that both the receiver noise temperature and the gain bandwidth can be improved by more than a factor of 2 by cleaning the interface and adding an additional superconducting interlayer to the contact pad. Using this we obtain a double sideband receiver noise temperature T[sub N,DSB]=950 K at 2.5 THz and 4.3 K, uncorrected for losses in the optics. At the same bias point, we obtain an IF gain bandwidth of 6 GHz. © 2004 American Institute of Physics.
ACCESSION #
12512666

 

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