  Vertical nanowires facilitate an innovative mechanism to channel the optical
field in the orthogonal direction and act as a nanoscale light source.
Subwavelength, vertically oriented nanowire platforms, both of plasmonic and
semiconducting variety can facilitate interesting far field emission profiles
and potentially carry orbital angular momentum states. Motivated by these
prospects, in this letter, we show how a hybrid plasmonic - organic platform
can be harnessed to engineer far field radiation. The system that we have
employed is an organic nanowire made of diaminoanthroquinone grown on a
plasmonic gold film. We experimentally and numerically studied angular
distribution of surface plasmon polariton mediated emission from a single,
vertical organic nanowire by utilising evanescent excitation and Fourier plane
microscopy. Photoluminescence and elastic scattering from single nanowire was
analysed individually in terms of in plane momentum states of the outcoupled
photons. We found that the emission is doughnut shaped in both
photoluminescence and elastic scattering regimes. We anticipate that the
discussed results can be relevant in designing efficient, polariton-mediated
nanoscale photon sources which can carry orbital angular momentum states.
