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Fig. 5 | Nano Convergence

Fig. 5

From: Chiral metamaterials: enhancement and control of optical activity and circular dichroism

Fig. 5

Demonstration of negative refractive index of chiral metamaterial. a Dextral (D, right-handed) and sinistral (S, left-handed) enantiomeric bilayer twisted Rosette structures [3]. b Chiral resonator array made of gold. The bottom strips make an angle 29.25° with the top bridge. The size of the unit cell is 40 μm by 40 μm and the scale bars are 20 μm [12]. c Schematics (top left) and SEM image (top right, bottom) of an array of right-handed twisted gold crosses [11]. d Schematics of a conjugated bilayer gammadion structure [49] e Calculated refractive indices for RCP and LCP waves for a conjugated bilayer gammadion structure [49]. The refractive index for RCP n R becomes negative at around 5.6 GHz

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