Wide gamut structural color modulation spectral analysis of periodic metasurface
In this paper,a new periodic metasurface has been devised based on the sandwich-type nanopillar structure of dielectric and absorber layers,which exhibits strong resonant absorption effect,and achieves the advanta-ges of wide gamut,high saturation and high resolution in the visible light band.The finite difference time domain(FDTD)method is used to simulate the optical response of periodic nanoarrays when the period and the thickness of the dielectric layer are adjusted,and the mapping relationship from structural parameters to color characteristics is es-tablished based on the reflection spectrum.The results show that the synergistic adjustment of the period and the thick-ness of the dielectric layer generates more abundant structural colors.The period significantly affects the hue by chan-ging the main wavelength,and the thickness of the dielectric layer helps to achieve high monochromatic color by opti-mizing spectral shape;the structure has high spectral reflectance,narrow half-peak width,and wide main coverage of the main wavelength,and the color gamut is expanded to 156.8％of sRGB;the optimized high-quality RGB color has a hue change of less than 0.075π at±40° incidence.The study is of great value in display imaging,nano-printing,high-resolution printing and other fields.
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