Abstract

A novel triple-band, tunable, high-efficiency, mid-infrared reflected cross-polarization converter based on a graphene metasurface is proposed and studied, which comprised a periodic ellipse graphene patch with a slit, a dielectric spacer, and a metal gold substrate. Numerical simulations indicate that the proposed converter can convert a linearly polarized wave to its cross-polarized wave at three resonance frequencies due to the superimposition of the two reflected components with a near 180° or 0° phase difference. The polarization conversion ratios of the three bands are 98.29%, 98.42%, and 97.64%, respectively. The polarization converter can be dynamically tuned by changing the Fermi energy. Our proposed tunable polarization converter has great potential in the application of electromagnetic polarization control.

© 2020 Optical Society of America

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