▎ 摘　　要

Graphene bilayered split rings (BSRs) are proposed to generate tunable circular dichroism (CD). BSRs with traditional materials do not elicit the CD effect because of C-4 symmetry. By contrast, BSRs with graphene can achieve the CD effect by varying the Fermi energy of each part of the split rings. The CD signal can be reversed from positive to negative or vice versa by exchanging the Fermi energy. CD effects can also be tuned by varying the Fermi energies of the different parts. This phenomenon indicates that the chirality of BSRs gradually change as the Fermi energy varies. This concept provides a method to change chirality and dynamically vary the CD effect without rebuilding the structures.