Single-layer chiral metasurface for circularly polarized light detection

Circular polarizers based on the metasurface suffer from a trade-off between the structural complexity and the polarization extinction ratio (ER). Herein, we present a single-layer chiral metasurface with strong circular dichroism. The structure turns a circularly polarized incident beam into a linearly polarized beam, achieving a high circular polarization ER. The operating wavelength of the proposed metasurface is tunable by changing the geometric parameters. The metasurface’s localized surface plasmon resonances between structures ensure strong chiral optical effects. We further experimentally demonstrate the circular dichroism of the fabricated metasurface.