High-purity and wide-angle reflective structural colors based on an all-dielectric Fabry-Prot cavity structure

High -purity structural colors with low fabrication cost are in demand for their commercial applications. Here, we demonstrate an all -dielectric Fabry-Perot cavity structure consisting of four -layer lossy and lossless dielectric films alternately stacked for producing high -purity and angle -invariant reflective colors. Multiple cavity resonances function together to significantly suppress the undesired reflection with the enhanced optical absorption, leading to a distinct and saturated color with a high efficiency of 70%. Besides, due to the high refractive indices of constituent materials, the color appearance of the designed structure can be maintained well at +/- 50(degrees) incident angle for two polarization states. The excellent color performance of the proposed device together with cost-effective manufacturing convenience opens up new avenues for their large -area applications in various areas. (c) 2024 Optica Publishing Group