  Rotational motion of charges in plasmonic nanostructures plays an important
role in transferring angular momentum between light and matter on the nanometer
scale. Although sophisticated control of rotational charge motion has been
achieved using spatially structured light, its extension to simultaneous
excitation of the same charge motion in multiple nanostructures is not
straightforward. In this study, we perform model calculations to show that
spatially homogeneous circularly polarized (CP) light can excite rotational
charge motions with a high degrees of freedom by exploiting the rotational
symmetry of the plasmonic structure and that of the plasmon mode.
Finite-difference time-domain simulations demonstrate selective excitation of
rotational charge motion for both isolated nanoplates and periodic array
structures, showing that complex charge rotations can be manipulated by plane
CP waves in a wide range of plasmonic structures.
