We present a wide, theoretical study of the emission of a point source (a quantum dot) in various waveguides:
fully dielectric, perfect-conductor-coated, gold-coated and based on photonic crystal. This study aims at
determining the most suitable structures to suppress the emission into the radiative modes or equivalently to
channel most of the emission into a single guided mode. We conclude that the structures, which exhibit the
highest β-factor, are promising devices for photonic applications.