Abstract
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.
Highlights
The achievement of structural color has shown advantages in large-gamut, high-saturation, high-brightness, and high-resolution
Due to the small thickness, the intrinsic material absorption is alleviated, and the maximal reflectance can be as high as 84%
It can be seen more clearly when the structural color of 63 samples are plotted in the CIE1931 color map
Summary
The achievement of structural color has shown advantages in large-gamut, high-saturation, high-brightness, and high-resolution. By combing Si metasurface with a refractive index matching layer, high-brightness and distinct structural color with diffraction-limit resolution has been realized.
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