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Superconductor-normal metal-superconductor junctions for signal amplification and harmonic multiplication

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3 Author(s)
V. Soares ; Inst. de Fisica, Univ. Fed. do Rio de Janeiro, Brazil ; A. M. Luiz ; R. Nicolsky

We report signal amplification and harmonic multiplication processes based on the nonlinear current-voltage characteristics (CVC) displayed by superconductor-normal metal-superconductor (SNS) junctions. Such junctions may exhibit a negative differential resistance at low voltages, the so called low-voltage-negative-differential-resistance (LVNDR) effect. This effect is due to the quantum mechanical multiple Andreev reflection mechanism in very clean systems and is stable against a bias voltage. Therefore, it is in principle possible to use these junctions as an active element in a variety of circuit applications such as oscillators, amplifiers or mixers, in the microwave and millimeter-wave range

Published in:

IEEE Transactions on Magnetics  (Volume:35 ,  Issue: 5 )