Reflective structural colors are of interest for many applications as alternatives to dyes and pigments and many different solutions have been proposed. The ideal systems should provide high reflectance efficiency while keeping good chromaticity and offering tunability throughout the visible spectral range. It is challenging to achieve such combined features with a simple single structure. Here we address this challenge using a concept that combines the Fabry–Prot effect with a broadband absorbing layer. Our easy-to-fabricate structures form highly reflective optical nanocavities with improved chromaticity throughout the visible compared with the two separate concepts. The addition of an additional cavity layer and a transparent top coating further improves the chromaticity and allows the formation of black surfaces.

反射结构色对于作为染料和颜料的替代物的许多应用是令人感兴趣的，并且已经提出了许多不同的解决方案。理想的系统应提供高反射效率，同时保持良好的色度并在整个可见光谱范围内提供可调性。用简单的单一结构来实现这样的组合特征是具有挑战性的。在这里，我们使用结合了Fabry–Prot效应和宽带吸收层的概念来应对这一挑战。与两个单独的概念相比，我们易于制造的结构形成了高度反射的光学纳米腔，并在整个可见光范围内改善了色度。添加附加的空腔层和透明的顶部涂层可进一步改善色度并允许形成黑色表面。