  We study the nonequilibrium exciton-polariton condensation in 1D to 0D and 1D
to 2D junctions by means of non-resonant spectroscopy. The shape of our
potential landscape allows to probe the resonant transmission of a propagating
condensate between a quasi-1D waveguide and cylindrically symmetric states. We
observe a distinct mode selection by varying the position of the non-resonant
pump laser. Moreover, we study the the case of propagation from a localized
trapped condensate state into a waveguide channel. Here, the choice of the
position of the injection laser allows us to tune the output in the waveguide.
Our measurements are supported by an accurate Ginzburg-Landau modeling of the
system shining light on the underlying mechanisms.
