High-Gap Nb-AlN-NbN SIS Junctions for Frequency Band 790–950 GHz
- 24 December 2015
- journal article
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Terahertz Science and Technology
- Vol. 6 (1) , 127-132
Abstract
We have designed, fabricated, and tested superconductor-insulator-superconductor (SIS) mixers based on Nb/AlN/NbN twin tunnel junctions for waveguide receivers operating in a frequency range of 790-950 GHz. Electromagnetic simulations and measurement results of the mixer performance are presented. The junctions have a high gap voltage of 3.15 mV and a high current density of about 30 kA/cm 2 , providing a wide receiver band, which was confirmed by Fourier transform spectrometer (FTS) and noise temperature measurements. The corrected receiver noise temperature varies from 240 K at low frequencies to 550 K at the high end of the band. The influence of the SIS junction heating on its characteristics has been studied and compared to another similar high current density technologies. The heating does not have a critical impact on the mixer performance.Keywords
This publication has 17 references indexed in Scilit:
- The current stage of development of the receiving complex of the millimetron space observatoryRadiophysics and Quantum Electronics, 2012
- Magnetic field dependence of the coupling efficiency of a superconducting transmission line due to the proximity effectApplied Physics Letters, 2009
- Niobium titanium nitride-based superconductor-insulator-superconductor mixers for low-noise terahertz receiversJournal of Applied Physics, 2005
- High quality Nb-based tunnel junctions for high frequency and digital applicationsIEEE Transactions on Applied Superconductivity, 2003
- Hot electron effect in terahertz hybrid devicesIEEE Transactions on Applied Superconductivity, 2001
- Very high-current-density Nb/AlN/Nb tunnel junctions for low-noise submillimeter mixersApplied Physics Letters, 2000
- Terahertz NbN/AlN/NbN mixers with Al/SiO/NbN microstrip tuning circuitsApplied Physics Letters, 1998
- High current density NbN/AlN/NbN tunnel junctions for submillimeter wave SIS mixersIEEE Transactions on Applied Superconductivity, 1997
- Broadband twin‐junction tuning circuit for submillimeter SIS mixersMicrowave and Optical Technology Letters, 1995
- Two-junction tuning circuits for submillimeter SIS mixersIEEE Transactions on Microwave Theory and Techniques, 1994