Fig. 1. Structrual diagram of the proposed multifunctional metamaterial device. (a) 3D schematic; (b) top view; (c) side view

Fig. 2. (a) Reflection coefficients and (b) PCR for different polarized incident terahertz wave through simulation

Fig. 3. Effects of structural parameters (a) b; (b) Z₃ and (c) R₁ on the PCR when the VO₂ is in the insulating state

Fig. 4. Absorption properties of the designed structure when VO₂ is in the metallic state. (a) Reflection coefficient and absorption properties; (b) real and imaginary parts of relative impedance

Fig. 5. Effects of structural parameters (a) b; (b) Z₃ and (c) R₁ on the absorption characteristics

Fig. 6. Electric field distributions of the top microstructure at resonant frequencies of (a) 1.64 THz and (b) 2.15 THz

Fig. 7. Absorption properties of metamaterial structure at different incident angles. (a) TE polarized incidence; (b) TM polarized incidence

Fig. 8. Performance analysis of the absorber when it is used as a sensor. (a) The variation of absorption with the refractive index of the sample; (b) the sensing characteristics at the frequency of 1.64 THz; (c) the sensing characteristics at the frequency of 2.15 THz