Improved superconducting hot-electron bolometer devices for the THz range

Conference paper (2004)
Department
Kavli Institute of Nanoscience (AS) (TU Delft)
Copyright: ©2004 Klapwijk, T.M., Barends, R., Gao, J.R., Hajenius, M., Baselmans, J.J.A.
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Published Date

08-10-2004

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Source:

Proceedings of SPIE, 2004 vol. 5498

Faculty

Applied Sciences

Department

Kavli Institute of Nanoscience

Abstract

Improved and reproducible heterodyne mixing (noise temperatures of 950 K at 2.5 THz) has been realized with NbN based hot-electron superconducting devices with low contact resistances. A distributed temperature numerical model of the NbN bridge, based on a local electron and a phonon temperature, has been used to understand the physical conditions during the mixing process. We find that the mixing is predominantly due to the exponential rise of the local resistivity as a function of electron temperature.