Generation of mode locked pulses using 2D triangular-Josephson junction arrays

We have numerically investigated the behavior of 2D triangular Josephson junction arrays (TJJAs) employed as rf sources. Each array is driven by (vertical) DC forcing currents at a carrier frequency /spl omega//sub 0/ and the rf output of each horizontal array junction is assumed to be coupled to an antenna and quasi optically summed in the far field. By superimposing (vertical) differential forcing currents that have constant increments from row to row, or that are applied to the outermost columns of the array, it is possible to, respectively, create mode-locked pulses above the array or steer the antenna array beam. By breaking the symmetry of the array from row to row it is possible to phase lock the array to create a monochromatic source.