Fig. 3

The surface electric field distribution of the upper metal layer: Meta-atom "0" under x-polarized and y-polarized wave incidence (a); Meta-atom "1" under x-polarized and y-polarized wave incidence (b); The surface current distribution of the upper metal layer. Meta-atom "0" (c) under x-polarized and y-polarized wave incidence; Meta-atom "1" (b) under x-polarized and y-polarized wave incidence.