Millimeter- and Submillimeter-Wave Phase-Locking in High-T_c Josephson Junction Arrays (Special Issue on Basic Properties and Applications of Superconductive Electron Devices)

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We report the strong microwave Josephson radiation from an array of high- T_c junctions on a MgO bicrystal substrate from centimeter- to millimeter-wave ranges. The dc bias current was fed to the junction array having parallel geometry with the pair of junctions shunted by superconducting loops. The configuration of bias leads was a series of interlocking dc SQUID's geometry which guaranteed the oscillation of all junctions at the same frequency. For a five-junctions array, we observed the coherent output power of about 13 pW at receiving frequency f_<REC>22 GHz without an external magnetic flux, which was nearly five times higher than that of a single bicrystal junction. We observed the Josephson linewidth of the self-radiation in coherent state less than 1 GHz by the adjustment of the external flux. The phase differences between adjacent junctions with different I_cR_n products could be controlled by an external small magnetic field. Submillimeter-wave detector response of the five-junction array was also studied experimentally at frequency f=478 GHz.
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1997-10-25