Structures for the Measurement of High‐Frequency Properties of Point‐Contact Josephson Junctions

摘要

Others have demonstrated that superconductor point‐contact Josephson junctions interact with electromagnetic fields having free‐space wavelengths as short as several hundred microns. To lay a theoretical foundation for more quantitative measurements of junction properties, we have undertaken an analysis of electromagnetic properties of three closed point‐contact structures and have computed how those structures influence a point‐contact junction described by a simple but plausible model. The analysis is in part an exercise in antenna theory; the conductors, superconductors, and dielectrics making up the structure act as an antenna for the intrinsically nonlinear Josephson junction.