Background Ultrathin photonic nanostructures, such as plasmonic and dielectric metamaterials and metasurfaces, have broad applications in electromagnetic wave manipulation, high resolution imaging, and computation. However, conventional production of these metastructures relies on precise nano-machining techniques that are difficult to manufacture...

Background Colorful pigments from pictures serve to selectively absorb light within a spectral range, thus modulating the light reflection and color display. Conventional pigments, however, are usually toxic and relatively large. They also tend to degrade over time and lose their brightness and resolution. Structural color is an alternative to conventional...