Meandering bicrystal Josephson junction arrays in a hemispherical Fabry–Perot resonator

Abstract

We have explored the coupling mechanism of a millimeter wave radiation to bicrystal Josephson junction arrays embedded in a Fabry–Perot resonator. In order to optimize the system, three-dimensional simulations and relative experiments were performed. By analyzing the results of computer simulations and experiments, we found that the layout of the array and the distance between the array and the plane mirror should minimize the effects on the electrical field E distribution in the fundamental mode of the Fabry–Perot resonator without the sample. In this case, the uniformity of the E field in the bicrystal arrays was demonstrated together with an improvement in the coupling efficiency of the mm wave irradiation to high-temperature superconductor arrays of Josephson junctions.

Radiation from Intrinsic Josephson Junctions in Misaligned Tl2Ba2CaCu2O8 Thin Films

“…For detecting the irradiation characteristic of the IJJs, microwave power is fed into the F-P resonator through a waveguide. To get an optimum coupling between the Josephson junctions and external microwave, the distance and angle between the horn antenna and the intrinsic Josephson junctions could be transformed [15,16], as well as the distance between the substrate and the plane Figure 3 shows the normalized temperature dependence of the critical current. It fits well with the AmbegaokarBaratoff theory for the critical current of the SIS junction near the critical temperature [17].…”

A method for self-radiation of Josephson junction arrays

“…We call this structure the substrate-grids-plane mirror (SGP) structure. Previous experiments have shown that a larger area of the uniform field and a high coupling efficiency to the BJJs can be achieved by this structure [15]. The distance between the array and the plane mirror is denoted by d. The coupling of microwave power to the external system from the resonator was performed via the open end of a standard waveguide arranged in the center of the spherical mirror.…”

“…Recently we suggested and successfully implemented a method of irradiating high-T c Josephson junctions by coupling them to the resonant modes of a millimeter wave Fabry-Perot (FP) resonator [15]. The FP resonator is an open resonator and can resonate at millimeter waves and even sub-millimeter waves with a high quality factor [16].…”