Figure 1.

(a)Schematic of the metamaterial absorber and the incident light polarization configuration. The thicknesses of Au squares, Ge₂Sb₂Te₅ spacer and Au mirror are 100 nm, 25 nm and 100 nm, respectively. The lattice constant in both x and y-directions is L = 300 nm and square dimension is d_x = d_y = 140 nm. The whole structure resides on a BK7 silica glass with 200 μm thickness. (b) Top view of the absorber. (c) Schematic of a 25 nm thick Ge₂Sb₂Te₅ dielectric layer with 100 nm thick ground Au layer deposited on a BK7 silica glass. (d) Schematic of the single Ge₂Sb₂Te₅ dielectric layer deposited on a BK7 silica glass.