Fig. 1. Schematic diagram of designed switchable metamaterial element structure

Fig. 2. Absorption characteristics of VO₂ in metallic state. (a) Absorption; (b) normalized impedance

Fig. 3. Top and side views of electric field distribution with resonance frequency of 2 THz. (a) Top view of TM wave; (b) top view of TE wave; (c) side view of TM wave; (d) side view of TE wave

Fig. 4. Influence of structural element parameters of absorber on absorptivity of device. (a) Different a values; (b) different b values; (c) different t values

Fig. 5. Absorption performance corresponding to different angles of incidence. (a) TE wave; (b) TM wave

Fig. 6. Absorption performance corresponding to different polarization angles. (a) TE wave; (b) TM wave

Fig. 7. Performance analysis as polarization converter. (a) Reflection coefficient; (b) phase difference; (c) ellipticity; (d) axial ratio

Fig. 8. PCR varies with frequency

Fig. 9. Influences of polarization converter elliptical patch parameters on PCR. (a) Parameter m; (b) parameter n

Fig. 10. PCR at different incident and polarization angles. (a) Incident angle; (b) polarization angle