Circular dichroism in planar extrinsic chirality metamaterial at oblique incident beam

We present a two dimensional planar extrinsic chirality metamaterial (2D-ECM) design that has strong circular dichroism (CD) in the visible spectrum range rather than usual near-infrared and terahertz range. The 2D-ECM is theoretically investigated by incident beam angles and meta-molecules unit sizes in visible spectrums. Physical mechanism was illustrated in figures of vector directions in electric field.