Direct detection effect in small volume hot electron bolometer mixers

Baselmans, J. J. A.; Baryshev, A.; Reker, S. F.; Hajenius, M.; Gao, J. R.; Klapwijk, T. M.; Vachtomin, Yu.; Maslennikov, S.; Antipov, S.; Voronov, B.; Gol'tsman, G.
April 2005
Applied Physics Letters;4/18/2005, Vol. 86 Issue 16, p163503
Academic Journal
We measure the direct detection effect in a small volume (0.15 μm×1 μm×3.5 nm) quasioptical NbN phonon cooled hot electron bolometer mixer at 1.6 THz. We find that the small signal sensitivity of the receiver is underestimated by 35% due to the direct detection effect and that the optimal operating point is shifted to higher bias voltages when using calibration loads of 300 K and 77 K. Using a 200 GHz bandpass filter at 4.2 K the direct detection effect virtually disappears. This has important implications for the calibration procedure of these receivers in real telescope systems.


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