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The authors demonstrate a chiral photonic metamaterial with chirality provided by electromagnetic coupling between mutually twisted unconnected layers. In the visible and near-IR spectral ranges, the material exhibits polarization rotatory power of up to 2500°∕mm and shows relatively low losses and negligible circular dichroism, making it a promising candidate for the development of chiral negative index media.
Plum et al. (Mon,) studied this question.