Abstract
Chiral metasurfaces have attracted much attention in recent years due to their gigantic intrinsic chirality compared with natural chiral materials. Recently, the independent manipulation of spin-selective absorption in different operating bands has become an urgent need and full of challenges. Here, a chiral metasurface is proposed with strong circular dichroism (CD) in two different terahertz frequency bands by piecing two typical mono-chiral units together. The two operating frequency bands of the spin-selective absorption can be independently designed by adjusting the configuration of the chiral unit structures. Such chiral metasurface may find potential applications in many areas, such as multispectral holographic imaging, optical encryption and information hiding, as well as chiral biomolecule detection.
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