2 种陶瓷阵列超结构表面的定向红外辐射

Two metasurfaces of ceramic arrays (A and B) were designed and the 11 μm infrared emission behaviors of them were studied. Both metasurfaces show obvious directed IR emissions. For array A, the radius of inner cylin⁃ der R₁ and thickness t₁ of the ceramics dominate the directional behavior of the IR emissions. The optimized struc⁃ tural parameters are R₁ = 1.0 μm and t₁ ≥1.2 μm with an effective IR emission angle θ in 0° ~ 50 ° and emissivity ε≥0.7 achieved. For array B with R_c = 1.05 μm,R₁ = 0.1 μm,t₁ = 0.85 μm, the IR emission is mainly constrained in θ> 10°, and an obvious ϕ dependence is observed as θ > 40°. The IR emission is higher at ϕ = 45° or 135° (±45°) as θ>10° with ε = 0.4 at θ = 65°. The IR emission is affected by the thickness t₁ obviously, with an effec⁃ tive thickness 0.3 μm≤t₁ ≤1.7 μm at R_c = 1.0 μm, R₁ = 0.3 μm, and ϕ = 0°. For array B with the optimized t₁ = 1.2 μm (ϕ = 0°), the IR emission is directed at θ ~ 40° with the emissivity 0.7.