Fig. 3: Structural coloring with FROCs.
From: Fano resonant optical coatings platform for full gamut and high purity structural colors
a, b Show photographs of fabricated FP nano-cavities and FROCs. c Shows photographs of blue, red, and green colors generated using the SiO2 capped FROC system. The color purity of FROCs is evident in (d) where the letters of U of R and CWRU are printed on a FP cavity by depositing 15 nm Ge layer. Scale bar = 1 cm. e The CIE 1931 color space showing the colors corresponding to the measured reflection spectrum of FP nano-cavities (blue circles) and FROCs (red circles). FROCs demonstrate higher purity as they are further away from the white point (black dot). Silica capped FROCs (red stars) show higher purity in the green region of the color space.
