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Small-Area Niobium/Aluminum Oxide/Niobium Junctions for SIS Mixers

Zmuidzinas, J. and Sharifi, F. and Van Harlingen, D. J. and Lo, K. Y. (1990) Small-Area Niobium/Aluminum Oxide/Niobium Junctions for SIS Mixers. In: Submillimetre Astronomy. Astrophysics and Space Science Library. No.158. Springer Netherlands , Dordrecht, pp. 69-70. ISBN 9789401568524.

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Submillimeter-wave SIS receivers require junctions with small RC products. The RC product can only be reduced by decreasing the thickness of the insulating barrier; however, this is generally accompanied by an increased subgap leakage current which adversely affects mixer performance. Thus, it is advantageous to choose a junction fabrication technology which produces inherently high quality barriers and low subgap leakage currents. Junctions fabricated from Nb/Al-Oxide/Nb trilayers (Gurvitch et al. 1983; Lichtenberger et al. 1988) are particularly well known in this regard, and have shown good performance when used in mm-wave mixers (Inatani et al. 1987; Pan et al. 1987). However, junction areas must be reduced to ≤ 1 µm² in order to meet impedance-matching requirements at submm wavelengths. Here we report Nb/Al-Oxide/Nb junctions which are among the smallest fabricated to date (see also Imamura and Hasuo 1988).

Item Type:Book Section
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Additional Information:© Springer Science+Business Media Dordrecht 1990.
Subject Keywords:Critical Current; Critical Current Density; Junction Area; Josephson Current; Radio Astronomy Observatory
Series Name:Astrophysics and Space Science Library
Issue or Number:158
Record Number:CaltechAUTHORS:20201008-112316984
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105921
Deposited By: George Porter
Deposited On:08 Oct 2020 21:05
Last Modified:16 Nov 2021 18:47

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