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A negative index of refraction due to three-dimensional chirality is demonstrated for abilayered metamaterial based on pairs of mutually twisted planar metal patterns in parallel planes, which alsoshows negative electric and magnetic responses and exceptionally strong optical activity and circular dichro-ism.
The experi-mentally observed negative index reaches â1.7 with a ï¬gure -50-40-30-20-10035791 RC ââ PLCP â â -30-150153035791Frequncy(GHz)ABCDTransmission (dB)arization azimuthrotation (deg)(a)(b) FIG. 2. Color online Circular dichroism and optical activity ofthe bilayered metamaterial.