Figure 5

(a) Measured (solid curves) and simulated (dashed curves) absorption spectral responses of the metasurface absorbers for l = 0.75 μm (black curves) and l = 0.85 μm (red curves) with identical Ni thicknesses of t = 12 nm. The inset shows the measured (black solid) absorption spectral response of Salisbury screen absorbers with a Ni thickness of t = 12 nm and calculated (black dashed) absorption spectral responses of Salisbury screen absorbers with R _s  = 50 Ω. (b) Retrieved effective surface impedances of the metasurfaces for l = 0.75 μm (black curves) and l = 0.85 μm (red curves) with identical Ni thicknesses of t = 12 nm.