Ultrathin Suspended Chiral Metasurfaces for Enantiodiscrimination (Adv. Mater. 37/2022)

Metasurfaces A self-aligned suspended chiral bilayer metasurface via single-step electron-beam lithography is reported by Tun Cao, Yan Jun Liu, and co-workers in article number 2203956. A huge optical chirality of 221° μm−1 is achieved by the free-standing metasurfaces with overall thickness of 100 nm. The bilayer metasurface demonstrates label-free discrimination of chiral molecules at zeptomole level, with sensitivity orders of magnitude larger than conventional circular dichroism spectroscopy.