Angle robust reflected plasmonic color palettes with expanded color gamut

By investigating the relationship between the color saturation and the square nanoblock period, the plasmonic color filters based on a two-dimensional metal–insulator–metal square nanoblock array structure with the optimum period are designed to generate highly saturated subtractive colors. Then, the realizable color gamut is broadly extended to 70% of the sRGB color space by introducing the supercell array consisted of centrosymmetric T-shaped dimers and the reflective full-color palette can provide a high angular tolerance of ∼30°. Moreover, the smooth transitions between two different colors can be achieved by mixing two types of supercell arrays with different dimensions. The supercell array structure also exhibits high sensitivities and good color responses when exposed on the ambient environments. Such excellent performances open the avenue for full-color display, colorimetric sensing, and filtering applications.