Fig. 4: Fabrication and characterization of SGM absorbers. | Nature Communications

Fig. 4: Fabrication and characterization of SGM absorbers.

From: Structured graphene metamaterial selective absorbers for high efficiency and omnidirectional solar thermal energy conversion

Fig. 4

a Schematic representations of steps in fabrication processes for preparing 3D SGM absorbers. b, c Photographs of b Cu foil and c SGM absorber, each having sample area of ~25 mm2. d Top-view SEM images of the SGM absorber at low and high magnification. e Measured reflectance and absorbance spectra of SGM absorbers having various hole widths (w) and periods (p): that is, w/p = 0.52/0.8 μm (red line) and w/p = 0.57/1 μm (blue line). The red dashed line and the blue dashed line are the simulated absorbance spectra of the H2 and H3 SGM absorbers, respectively.

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