Collective polarization-dependent plasmon routing by means of spin-locking metasurface

We propose a spin-locking metasurface incorporating a transverse spin of the SP wave to selectively route the nearfield beams. Owing to the combination of the oblique incidence of circularly polarized light with the accurately designed momentum matching of the grating we achieve a precise directional control over the plasmonic distributions. The experimental verification of the directional launching is performed by a time-resolved leakage radiation measurements allowing one to visualize the shape and the dynamics of the excited beam.