Emission of radiation from square arrays of stacked Josephson junctions

We propose a design for two-dimensional arrays of stacked Josephson junctio ns and study their properties as coherent sources of radiation in the mm an d sub-mm wavelength range. This design can be implemented by using either m esas of intrinsic Josephson junctions, from crystals of high T-C supercondu ctors, or artificial stacks of low T-C junctions. We outline a possible Nb/ AlOx/Nb trilayer fabrication process for such devices. Our model for the dy namics of the system predicts the range of parameters over which the juncti ons synchronize. (C) 2001 American Institute of Physics.