Figure 1

Figure 1: Different paths toward a chiral metamaterial, which can rotate the polarization of incident light. (a) A planar array of metallic split-ring resonators is chiral when light strikes the surface of the plane at an oblique angle. (b) An elongated split-ring resonator is chiral even at normal-incidence. (c) The bilayered metallic chiral structure has a negative index of refraction at microwave frequencies [1].