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. 2015 Oct 1;6:8422. doi: 10.1038/ncomms9422

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(a) Enantiomeric chirality switching of the spiral structures is performed by changing the deformation direction of a planar Archimedean spiral. (b) The spiral structures are arrayed to form a chirality-switchable metamaterial. The polarization state of the THz wave is modulated by the optical activity of the metamaterial as the light passes through the metamaterial.