Fig. 1. Structural diagram of 3×3 unit in proposed polarizer

Fig. 2. Simulated results of LP conversion pattern under y-polarized incident wave. (a) ryy and rxy; (b) PCR; (c) polarization azimuth angle; (d) rxy/ryy and Δφxy

Fig. 3. Effect of intermediate dielectric thickness on LP conversion performance obtained by simulation. (a) Effect on ryy; (b) effect on rxy; (c) effect on PCR; (d) effect on Δφxy

Fig. 4. Simulated results after increasing intermediate dielectric thickness. (a) rxy; (b) PCR

Fig. 5. Simulated results after continuously increasing Fermi level. (a) PCR; (b) Δφxy

Fig. 6. Polarization conversion efficiency corresponding to metal meta-surface. (a) Gold meta-surface polarizer; (b) copper meta-surface polarizer

Fig. 7. Simulated results of electromagnetic wave incident along u axis and v axis, respectively. (a) Amplitude of reflection coefficient (inset indicating principle diagram of polarization conversion); (b) phase

Fig. 8. Surface current distributions on Dirac semimetal and PEC ground sheet at different resonant frequencies. (a) 1.44 THz; (b) 1.95 THz