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Directional excitation of guidance modes is central to many applicationsranging from light harvesting, optical information processing to quantumoptical technology. Of paramount interest, especially, the active control ofnear-field directionality provides a new paradigm for the real-time on-chipmanipulation of light. Here we find that for a given dipolar source, itsnear-field directionality can be toggled efficiently via tailoring thepolarization of surface waves that are excited, for example, via tuning thechemical potential of graphene in a graphene-metasurface waveguide. Thisfinding enables a feasible scheme for the active near-field directionality.Counterintuitively, we reveal that this scheme can transform a circularelectric/magnetic dipole into a Huygens dipole in the near-field coupling.Moreover, for Janus dipoles, this scheme enables us to actively flip theirnear-field coupling and non-coupling faces.

Toggling Near-field Directionality via Polarization Control of Surface Waves