Low-noise submillimeter-wave NbTiN superconducting tunnel junction mixers
- 20 December 1999
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 75 (25), 4013-4015
- https://doi.org/10.1063/1.125522
Abstract
We have developed a low-noise 850 GHz superconductor–insulator–superconductor quasiparticle mixer with NbTiN thin-film microstrip tuning circuits and hybrid Nb/AlN/NbTiN tunnel junctions. The mixer uses a quasioptical configuration with a planar twin-slot antenna feeding a two-junction tuning circuit. At 798 GHz, we measured an uncorrected double-sideband receiver noise temperature of at 4.2 K bath temperature. This mixer outperforms current Nb SIS mixers by a factor of nearly 2 near 800 GHz. The high-gap frequency and low loss at 800 GHz make NbTiN an attractive material with which to fabricate tuning circuits for SIS mixers. NbTiN mixers can potentially operate up to the gap frequency,
Keywords
This publication has 17 references indexed in Scilit:
- Observation of Andreev Reflection Enhanced Shot NoisePhysical Review Letters, 1997
- Quasi-optical NbN/AlN/NbN mixers in submillimeter wave bandIEEE Transactions on Applied Superconductivity, 1997
- Noise and gain in frequency mixers with NbN SIS junctionsIEEE Transactions on Applied Superconductivity, 1997
- Low-noise 1 THz niobium superconducting tunnel junction mixer with a normal metal tuning circuitApplied Physics Letters, 1996
- Submillimeter receivers for radio astronomyProceedings of the IEEE, 1992
- Performance of NbN superconductive tunnel junctions as SIS mixers at 205 GHzIEEE Transactions on Magnetics, 1991
- Niboium-titanium nitride thin films for superconducting rf accelerator cavitiesJournal of Low Temperature Physics, 1990
- Quantum detection at millimeter wavelengthsReviews of Modern Physics, 1985
- Quantum limited detection in tunnel junction mixersIEEE Journal of Quantum Electronics, 1979
- Preparation and Superconducting Properties of Thin Films of Transition Metal Interstitial CompoundsJournal of Vacuum Science and Technology, 1969