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

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7 Author(s)
Baselmans, J.J.A. ; Space Research Organisation of the Netherlands (SRON), Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands ; Hajenius, M. ; Gao, J.R. ; Klapwijk, T.M.
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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=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.

Published in:

Applied Physics Letters  (Volume:84 ,  Issue: 11 )

Date of Publication:

Mar 2004

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