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We investigate the radiation properties of a short horizontal dipole embeddedin a uniaxial wire medium. It is shown that the uniaxial wire medium enables asuper-collimation of the dipole radiation such that the radiation pattern has asingularity and the radiated fields are non-diffractive in the broadsidedirection. We derive a closed analytical formula for the power radiated by thedipole. Our theory demonstrates that as a consequence of the ultrahigh densityof photonic states of the nanowire array, the power radiated by the dipole isstrongly enhanced as compared to that emitted in the dielectric host material.

Super collimation of the radiation by a point source in a uniaxial wire medium