Figure 2 | Experimental demonstration of dual-functional metasurface. (IMAGE)
Caption
Figure 2 | Experimental demonstration of dual-functional metasurface. a Simulated reflectance spectra of meta-atom 1 (top), meta-atom 2 (middle), and meta-atom 3 (bottom). The insets show the resulting structural colors under white light illumination, green, brown, and magenta, respectively. b CIE 1931 chromaticity diagram showing the simulated (circles) and measured (stars) color coordinates for each meta-atom. c–e (i) Scanning electron microscope (SEM) images of the fabricated metasurfaces; (ii) Corresponding optical microscope images showing the structural colors under white light illumination; and (iii) Holographic image reconstructions of the university logo under red laser illumination. The scale bars in the SEM images represent 1 µm. f Optical and SEM characterization of Flower Sample 1: (i, ii) SEM images of different selected regions showing spatially assigned meta-atoms; (iii) Optical microscope image of the printed color pattern. g Optical and SEM characterization of Flower Sample 2: (i) Optical microscope image of the printed color pattern; (ii, iii) SEM images of different selected regions showing spatially assigned meta-atoms. h Holographic images reconstructed under 640 nm coherent illumination: (i) POSTECH university logo from Flower Sample 1, and (ii) “POSTECH” text from Flower Sample 2. Scale bars: 2 µm and 4 µm for SEM images, 50 µm for optical microscope images. i Examples of broadband holographic images reconstructed from Flower Sample 1.
Credit
Junsuk Rho et al.
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CC BY