SIS technology development to serve Next Generation receivers for ALMA
Paper in proceeding, 2022
Modern radio astronomy demands for broadband receiver systems. For SIS mixers, this translates into objective to employ superconducting tunnel junctions with a very low RnA and low specific capacitance. The traditionally used Nb/AlO x /Nb junctions have largely approached their physical limit of minimizing those parameters. It is commonly recognized that it is AlN-barrier junctions, which are needed for further progressing of the broadband SIS mixer instrumentation for radio astronomy. In this work, we present the progress in development of the process for high quality Nb/Al-AlN/Nb superconducting tunnel (SIS) junctions’ fabrication and their characterization in terms of their specific capacitance.
SIS junctions
specific capacitance
AlN tunnel barrier
Author
Alexei Pavolotski
Chalmers, Space, Earth and Environment, Onsala Space Observatory
Takafumi Kojima
National Astronomical Observatory of Japan
Sho Masui
National Astronomical Observatory of Japan
Victor Belitsky
Chalmers, Space, Earth and Environment, Onsala Space Observatory
32nd International Symposium of Space Terahertz Technology, ISSTT 2022
32nd IEEE International Symposium on Space THz Technology (ISSTT 2022)
Baeza, Spain,
Baeza, Spain,
Subject Categories (SSIF 2011)
Aerospace Engineering
Astronomy, Astrophysics and Cosmology
Other Electrical Engineering, Electronic Engineering, Information Engineering