Optimization of Bicrystal Josephson Junctions and Arrays in a Fabry-Perot Resonator

• Published in: IEEE transactions on applied superconductivity Vol. 17; no. 2; pp. 934 - 937
• Main Authors: He, M., Klushin, A.M., Yan, S.L., Klein, N.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Circuit properties; Electric, optical and optoelectronic circuits; Electromagnetic coupling; Electromagnetic fields; Electromagnetic wave polarization; Electronics; Exact sciences and technology; Fabry-Perot; Fabry-Perot resonator; Frequency; High temperature superconductors; high-temperature superconductor; Integrated optics. Optical fibers and wave guides; Josephson junction array; Josephson junctions; Millimeter wave technology; Optical and optoelectronic circuits; Resonance; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Superconducting devices; Superconducting thin films; voltage metrology; Josephson junction; Optimization method; Microwave; voltage metrology; Experimental study; Optimization; Thin film; Millimetric wave; Electric field; THz range; Josephson effect; Josephson junction array; Measuring system; Polarizer; Numerical simulation; System simulation; Electromagnetic field; Measurement method; Fabry Perot resonator; high-temperature superconductor; High temperature superconductor; Fabry-Perot resonator
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2007.898140

We report on the investigation of the coupling mechanism of a resonant millimeter wave electromagnetic field with bicrystal Josephson junction arrays embedded in a hemispherical Fabry-Perot resonator. We have found that our 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 field in the resonator was measured. Numerical field simulations confirm this model. According to this model, the dimension and interval of the grids and the dimension of the Josephson junctions are optimized by simulations and experiments. After optimized, a maximum Josephson voltage of 28 mV for an array of 182 bicrystal junctions at a temperature of 75 K and a frequency of 74.39 GHz was achieved for the first time. Our coupling method has a strong potential to be used up to terahertz frequencies.