Open AccessDoubling of sensitivity and bandwidth in phonon cooled hot electron bolometer mixers
Author(s) -
J. J. A. Baselmans,
M. Hajenius,
J. R. Gao,
T. M. Klapwijk,
P. A. J. de Korte,
B. Voronov,
Gregory Goltsman
Publication year - 2004
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.1667012
Subject(s) - bolometer , sideband , terahertz radiation , noise temperature , bandwidth (computing) , optoelectronics , superconductivity , physics , phonon , electron , materials science , noise equivalent power , optics , condensed matter physics , responsivity , detector , photodetector , microwave , phase noise , telecommunications , quantum mechanics , computer science
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 TN,DSB 5950 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. @DOI: 10.1063/1.1667012 #
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