Preparation and properties of Nb/Al SIS and SIN junctions for millimeter and submillimeter radioastronomical receivers

Astronomy and Astrophysics – Astronomy

Scientific paper

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Niobium, Radio Astronomy, Receivers, Sis (Superconductors), Design Analysis, Junction Diodes, Research And Development, Tunnel Diodes

Scientific paper

The sharp onset of the quasiparticle current in Superconductor Insulator Superconductor (SIS) tunnel junctions is used for frequency mixing in radioastronomical receivers. Efforts to develop and routinely produce various Nb based devices for frequencies up to 690 GHz are outlined. The fabrication and properties of single (SIS) and double barrier (SISIS) devices, anodization spectroscopy, thermal annealing, a method to prepare submicron junctions using optical lithography and on Nb based SIN junctions, are reported. The latter type has no Josephson effects which can interfere with low noise quasiparticle mixing.

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