Figure 1.

(a) Schematic of the proposed multi-band absorber. (b) Side view for one unit cell of the multi-layer composed structure. The detailed parameters are p = 85 µm, t₁ = 6 µm, t₂ = 5 µm, t₃ = 20 µm, d₁ = d₂ = 0.4 µm, d₃ = d₄ = 1 µm. (c) Top view for one unit cell of periodic VO₂ rings and Au rings, where r₁ = 40 µm, w₁ = 4 µm, r₂ = 25 µm, w₂ = 2 µm.