Abstract
In this paper, a multi-band tunable metamaterial absorber with vanadium dioxide (VO2) layer is proposed and verified in terahertz (THz) band. At Room temperature, two absorption peaks (P1 and P2) are achieved at 5.08 and 34.42 THz, respectively. The P1 peak is results by the local surface plasmon (LSP) modes resonance, while the P2 peak is excited by the surface plasmon polarization (SPP) modes resonance. With the increase of temperature, new absorption resonance behaviors are excited based on the phase transition properties of the VO2 layer. Two new absorption peaks P3 and P4 are revealed at frequencies 8.3 and 28.46THz, respectively. Both P1 and P2 peaks remain stable even when the temperature is increased from 300 K to 400 K. It is found that the P3 peak is revealed by the hybridization of LSP modes, while the P4 peak is excited by the Fabry-Perot resonance. This proposed metamaterial absorber demonstrates two characteristics: P1 and P2 peaks are insensitive to temperature, while P3 and P4 peaks are temperature tunable.
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