Spin-controlled directional launching of surface plasmons at the subwavelength scale
Huang Tao1, Wang Jia-jian2, Li Zi-wei2, Liu Wei1, Lin Feng1, Fang Zhe-yu1, 3, Zhu Xing1, 4, †,
       

(a) Two intersecting slits with the intersection angle θ. (b) Two intersecting slits with the intersection angle θ. d indicates the distance between the midpoint of two slits.