Arrays of high-Tc Josephson junctions in open millimeter wave resonators

Abstract

The authors have explored the coupling mechanism of a millimeter wave radiation to bicrystal Josephson junction arrays embedded in a hemispherical Fabry-Pérot resonator. The authors have found that their high-temperature superconductor array can be modeled as a thin film grid polarizer. In agreement with this model, a strong dependence of the coupling of the Josephson junctions on the polarization of the electric filed in the resonator was observed. The authors achieved a maximum Josephson voltage of 28mV for an array of 182 bicrystal junctions at a temperature of 75K and a frequency of 74.4GHz.