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We experimentally demonstrate that a linear dipole is not restricted to emitlinearly polarised light, provided it is embedded in the appropriatenanophotonic environment. We observe emission of various ellipticalpolarisations by a linear dipole including circularly polarised light, withoutthe need for birefringent components. We further show that the emitted state ofpolarisation can theoretically span the entire Poincare sphere. Theexperimental demonstration is based on elongated gold nanoparticles (nanorods)deposited on an optical nanofibre and excited by a free-space laser beam. Thelight directly collected in the guided mode of the nanofibre is analysed inregard to the azimuthal position and orientation of the nanorods, observed bymeans of scanning electron microscopy. This work constitutes a demonstration ofthe mapping between purely geometrical degrees of freedom of a light source andall polarisation states and could open the way to new methods for polarisationcontrol of light sources at the nanoscale.

Polarisation control of linear dipole radiation using spin-momentum locking of light