Fig. 2: Multispectral camouflage for visible, MIR, lasers, and microwave.
From: Multispectral camouflage for infrared, visible, lasers and microwave with radiative cooling
a The measured visible reflectance and optical images for top ZnS layer of thickness varying from 30 nm to 270 nm. The chromaticity coordinates (x, y) are written on the corresponding optical images (insets). b The measured reflectance in the MIR range for the different values of top ZnS layer thickness. c The electric field |E| and resistive loss Q in the ZnS/Ge multilayer selective emitter for wavelengths of 1.55 μm, 4.5 μm, 6.15 μm, 9 μm, and 10.6 μm. The thicknesses of the Ge/ZnS multilayer films are 0.721/0.982/0.721/0.559/0.234/0.438/0.206/0.438/0.552/1.18/0.701 μm (from top to bottom). d The reflectance spectrum near 1.55 μm. e The Cu-ITO-Cu microwave absorptive metasurface. f The reflectance spectra corresponding to the Cu-ITO-Cu microwave absorber metasurface and the combined structure. g The normalized magnetic field intensity (color) and electric field (arrow) on the cross-section I (x–z plane, parallel to polarization); the normalized resistive loss (color) and surface currents (arrow) on the cross-sections II and III, respectively (x–y plane, perpendicular to wave vector). The frequency is 10 GHz.
