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    Nature Communications:The team of Professor Xiao Shumin from school of material science and engineering of Harbin Institute of Technology (Shenzhen) has made new progress in the field of structural color


    The achievement of structural color has shown advantages in large-gamut, high-saturation, high-brightness, and high-resolution. While a large number of plasmonic/dielectric nanostructures have been developed for structural color, the previous approaches fail to match all the above criterion simultaneously. Herein we utilize the Si metasurface to demonstrate an all-in-one solution for structural color. Due to the intrinsic material loss, the conventional Si metasurfaces only have a broadband reflection and a small gamut of 78% of sRGB. Once they are combined with a refractive index matching layer, the reflection bandwidth and the background reflection are both reduced, improving the brightness and the color purity significantly. Consequently, the experimentally demonstrated gamut has been increased to around 181.8% of sRGB, 135.6% of Adobe RGB, and 97.2% of Rec.2020. Meanwhile, high refractive index of silicon preserves the distinct color in a pixel with 2 × 2 array of nanodisks, giving a diffraction-limit resolution.

    Fig. 1: The direct comparison of different structural color technologies in spatial resolution, manufacturability, reflectance (or transmittance), FWHM ratio, and gamut.

    This innovative research uses the combination of the refractive index matching layer and the monocrystalline silicon supersurface to achieve an integrated breakthrough in the five parameters of structural color. This progress is expected to be the commercialization of structural color in the fields of dynamic display, optical security, and information storage. Applications bring new ways. The research results were published online in the journal Nature Communications with the title "All-dielectric metasurface for high-performance structural color".

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