Abstract

We propose a Babinet-invertible chiral metasurface for achieving dynamically reversible and strong circular dichroism (CD). The proposed metasurface is composed of a ${\rm VO}_2$–metal hybrid structure, and when ${\rm VO}_2$ transits between the dielectric state and the metallic state, the metasurface unit cell switches between complementary structures that are designed according to Babinet’s principle. This leads to a large and reversible CD tuning range between $\pm0.5$ at 0.97 THz, which is larger than the one found in the literature. We attribute the CD effect to extrinsic chirality of the proposed metasurface. We envision that the Babinet-invertible chiral metasurface proposed here will advance the engineering of active and tunable chiro-optical devices and promote their applications.

© 2021 Optical Society of America

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