  We demonstrate that interacting spasers arranged in a 2D array of arbitrary
size can be mutually synchronized allowing them to supperradiate. For arrays
smaller than the free space wavelength, the total radiated power is
proportional to the square of the number N of spasers. For larger arrays, the
radiation power is linear in N. However, the emitted beam becomes highly
directional with intensity of radiation proportional to N^2 in the direction
perpendicular to the plane of the array. Thus, spasers, which mainly amplify
near fields, become an efficient source of far field radiation when they are
arranged into an array.
