  We prove experimentally, upon polarization analysis performed on a large
statistic of single nanoemitters, that high quality core/shell CdSe/CdS
dot-in-rods behave as linear dipoles. Moreover, the dipole in-plane and
out-of-plane orientations could be assessed. We demonstrate in particular that,
contrary to expectations, the emitting dipole is not aligned with the elongated
axis of the dot-in-rod. Besides, the polarimetric measurements prove that the
excitation transition cannot be approximated by a single linear dipole,
contrary to the emission transition. Finally, we highlight that non-radiative
channels of charge carrier recombination do not affect the dipolar nature of
the radiative transitions.
