Fig. 4From: Chiral metamaterials: enhancement and control of optical activity and circular dichroismNegative refractive index of chiral metamaterial. Band diagram of chiral metamaterial with a resonator with resonance frequency ω 0 [5]. In the grey region between ω 1 and ω 2, negative refraction can be achieved for the LCP waves since the group velocity (v g ) and phase velocity (v p ) have opposite signsBack to article page