  Regular arrays of two-level emitters at distances smaller that the transition
wavelength collectively scatter, absorb and emit photons. The strong
inter-particle dipole coupling creates large energy shifts of the collective
delocalized excitations, which generates a highly nonlinear response at the
single and few photon level. This should allow to implement nanoscale
non-classical light sources via weak coherent illumination. At the generic
tailored examples of regular chains or polygons we show that the fields emitted
perpendicular to the illumination direction exhibit a strong directional
confinement with genuine quantum properties as antibunching. For short
interparticle distances superradiant directional emission can enhance the
radiated intensity by an order of magnitude compared to a single atom focused
to a strongly confined solid angle but still keeping the anti-bunching
parameter at the level of $g^{(2)}(0) \approx 10^{-2}$.
