Optical spin-to-orbital angular momentum conversion in structured optical fields

Zhao Yang¹, Yang Cheng-Xi¹, Zhu Jia-Xi¹, Lin Feng^{1, †}, Fang Zhe-Yu^{1, 2, 3, 4, ‡}, Zhu Xing^{1, 2, 4}

The incident light is elliptically polarized, with (a₁) (θ,ϕ) = (140°, 90!°); (b₁) (120°, 90°); (c₁) (60°, 90°); (d₁) (42°, 90°). (a₂), (b₂), (c₂), and (d₂) show the corresponding direction of P^O relative to the Ag NW axis. The color in the Ag NW represents the electric field of SPPs propagating along the NW.