Figure 1.

(a) Schematic representation of the super-cell of the broadband metasurface absorber consisting of 16 resonant elements forming a square array. The lengths of the crosses are l₁ = 200 nm, l₂ = 180 nm, l₃ = 160 nm, and l₄ = 140 nm, and all crosses have identical arm widths w = 50 nm. The diameters of the circles are d₁ = 140 nm, d₂ = 120 nm, d₃ = 100 nm, and d₄ = 50 nm. (b) Simulated reflectance, transmittance, and extinction spectra at normal incidence. The gray curve shows the AM1.5 solar spectrum, normalized to fit the scale of the plot.