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Schematic of the unit cell of the planar chiral metamaterials under consideration : (a) two relatively rotated layers of four U-SRRs, (b) and (c) two layers of Z-type crosses with φ = 90° and φ = 60°, respectively; the back-layer is the mirror image of the front layer; (d) two relatively rotated layers of cross-wires and (e) design based on two relatively rotated squares. The metal (yellow-color) thickness tm and the dimensions ax, ay, L, w, a, d, φ and s, for each design are presented in Table 1. In Figure 1d grey color corresponds to photoconductive silicon. The wave propagation is along the z direction.
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