1：Experimental Design and Method Selection:

The study involves the design and simulation of a graphene metasurface for polarization conversion. The metasurface is composed of a single layer of graphene with half ring slots connected by a rectangular slot, rotated at 45o, on a silicon dioxide substrate with a metal-backed ground.

2：Sample Selection and Data Sources:

The metasurface cell is designed with specific dimensions and materials, including graphene with a thickness of 20 nm and a chemical potential of 0.4 eV.

3：4 eV. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Graphene sheet, silicon dioxide substrate, gold ground.

4：Experimental Procedures and Operational Workflow:

The cell is simulated to study co- and cross-polarized reflection coefficients, PCR, surface current distribution, and the effect of different angles of incidence.

5：Data Analysis Methods:

The simulation results are analyzed to evaluate the performance of the metasurface in terms of PCR and its stability over a range of incident angles.