Generalized approach to plasmonic phase modulation in topological bi-gratings

We study the role of optical momenta in surface plasmon excitation by topological bi-gratings. analyze plasmonic structures composed rectangular apertures rotating 2D space with given rates, which couple to specific trajectories. experimentally demonstrate control propagation through premeditated design gratings, interact linear, spin, and orbital angular momentum light. show that these trajectories can be selected purely modulation numerous degrees freedom for a structure geometry. Moreover, it is shown symmetry final distribution defined selecting rotation different from original grating symmetry.