Dynamically reversible and strong circular dichroism based on Babinet-invertible chiral metasurfaces
Abstract
We propose a Babinet-invertible chiral metasurface for achieving dynamically reversible and strong circular dichroism (CD). The proposed metasurface is composed of a V O 2 –metal hybrid structure, and when V O 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 ± 0.5 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.
- Publication:
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Optics Letters
- Pub Date:
- March 2021
- DOI:
- 10.1364/OL.421016
- arXiv:
- arXiv:2101.12329
- Bibcode:
- 2021OptL...46.1309L
- Keywords:
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- Physics - Optics;
- Physics - Applied Physics
- E-Print:
- 8 pages, 6 figures