Tunnel junction and superconducting devices for ultra-high-performance cryogenic circuits and detectors
For the past 30 years, VTT has provided solutions and services for superconductor and tunnel junction device design and fabrication. We also help clients with small scale production.
Trilayer Josephson junctions
A niobium-aluminium/aluminium oxide-niobium Nb/Al-AlOx/Nb trilayer structure provides a robust technology for Josephson junction-based devices and circuits. Device operating temperature can range from 4 Kelvin down to sub-Kelvin temperatures, using up to three superconducting layers.
Al-Al2O3-based tunnel junctions
Tunnel junction technology with an Al bottom electrode and Al2O3 tunnel barrier is well suited for devices with low and/or high junction transparency. It supports both high device complexity and integration of additional passive elements.
Some applications include:
Suspended tunnel junctions and superconducting bridges for bolometer applications
Suspended NbN bridges and Nb/Al-AlOx/Nb trilayer tunnel junctions are well suited for bolometric detection of THz radiation.