A F-shaped Terahertz Chiral metasurface with a high circular dichroism

we propose a chiral metasurface with high circular dichroism to detect the circular polarization (CD) and biological macromolecules. The unit of the metasurface is three layers consisting of a F-shaped metal structure, a dielectric substrate and a metal back ground. The proposed metasurface can realize a strong CD of 0.82, which has potential applications in the detection of the circular polarization (CD) and biological macromolecules.