HP Labs Technical Reports

Analysis of Fiske Resonances in Modern Josephson Geometries

Lee, Gregory S.



Abstract: Internal resonances in Josephson tunnel junctions can provide information about the phase velocity of electromagnetic waves propagating along the junction. This phase velocity, in turn, provides information relating the specific capacitance of the junction to the sum of the magnetic penetration depths in the superconducting electrodes or vice versa. In all but the most elementary geometries, however, the interpretation of the measured phase velocity is not straightforward and an overly simplistic interpretation can lead to wrong assigned values for the specific capacitance. A comprehensive analysis of junction resonances is presented, based on the two-dimensional wave equation for a scalar current potential with proper boundary conditions.

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