The Study Of Wide Gamut Structural Color Based On Surface Plasmon

Due to the disadvantages of environmentally unfriendly,fading and low spatial resolution of traditional color pigments,their applications in advanced color display and spectral imaging equipment are limited.Structural color is a kind of environment-friendly color which is not easy to fade due to the absorption,scattering and interference of light by micro nano structure.Among them,the metal structure based on surface plasmon has strong resonant absorption of light,so that a single nano-level metal structure can show very bright colors.Therefore,structural colors based on surface plasmons have attracted much attention due to their extremely high spatial resolution.In recent years,people have done a lot of structural color research based on surface plasmon,but they can not meet the requirements of high color saturation,polarization and incidence angle insensitivity and high gamut display at the same time.In order to solve the above problems and meet the display requirements,this paper designs a periodic color development structure of gold/silica/gold nanodisks based on surface plasmons.The reflection spectrum of the structure was simulated and calculated using the finite difference time domain method,and the insensitivity of the structure to incident polarized light and angle was explored.On this basis,the reflection spectral line of standard light source is calculated as the color space by using the mapping relationship.The effects of the arrangement period of the structural parameters,the diameter of the gold nanodisk and the thickness of the silica layer on the hue,saturation and lightness of the color were studied.Finally,by adjusting the three-dimensional structure parameters,such as the arrangement period,the diameter of the gold nanodisk and the thickness of the silica layer,the wide color gamut structure color is realized.In order to further improve the durability and damage resistance of the color rendering structure,and increase its applicability and flexibility in the environment,this paper coats the designed structure with a layer of highly transparent polymethyl methacrylate(PMMA).For protective coating.The finite difference time domain method was used to analyze the electric field distribution of the structure coated with the PMMA protective layer,and the difference in light absorption of the structure with or without the PMMA protective layer was compared.The color tunability of the structure with protective layer was studied,and it was proved that the structure with PMMA protective layer had the same tunable performance as the structure without protective layer.Under the premise of almost no influence on the high color gamut,a color development technology with high resolution,polarization and angle insensitivity is obtained,which is suitable for complex environment and has better durability.With the development of micro-nano processing technology,structural colors based on surface plasmons will play a powerful role in color printing,surface decoration,digital color display,molecular sensing,information encryption,and information storage.