Fig. 1. Contour plot of ζ ^J=1,M=0(r, r ₁), eqn (12), for r ₁ at the chiral center (left column) and at the center of the benzene ring (right column). The position corresponding to the chosen value of r ₁ is depicted by a red dot. Other components M = 1 and M = –1 are not considered in this article since they interact with the longitudinal part of the incoming field.