Heterodyne mixing with Nb tunnel junctions above the gap frequency
- de Lange, G.
- Honingh, C. E.
- Kuipers, J. J.
- Schaeffer, H. H. A.
- Panhuyzen, R. A.
- Klapwijk, T. M.
- van de Stadt, H.
- de Graauw, M. M. W. M.
DOIAbstract
The noise and gain of a heterodyne waveguide mixer employing Nb/Al2O3/Nb superconducting tunnel junctions with an on-chip integrated tuning element are measured and analyzed at 680-750 GHz and at 840 GHz. The lowest receiver noise temperatures are 400 K (double side band) at 720 GHz and 1500 K (3000 K including the beam splitter loss) at 840 GHz. We compare data of the pumped I-V curves with the quantum theory of mixing and demonstrate good agreement at frequencies well above the gap frequency
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