Tunable Subtractive Structural Colors Enabled by Phase‐Change Metasurfaces

Abstract Structural colors originating from the metasurface show irreplaceable advantages in high resolution, long‐term stability, and vivid displays. However, the reconfigurable regulation of the structural color metasurface remains challenging for that once the structure of the metasurface is fixed, the optical response is also determined. Here, structural color metasurfaces are designed and experimentally demonstrated, composed of a metallic reflector and sandwiched nanopillars based on the phase change material Sb₂S₃. Abundant colors are obtained by tuning the critical dimensions of the nanoresonator for what determines the response frequency of the magnetic dipoles, which manifests a reflection dip (absorption peak) in the spectrum curve. Most importantly, the on‐off of displacement current during the phase change process also results in a distinctive reflectance and thus provides the basis for the active color control. Cyan, magenta, and yellow are taken as examples, and it is verified that the structural color can be actively tuned by switching the Sb₂S₃ between the amorphous and crystalline states. The metasurface of this work gives a novel platform for the reconfigurable structural color, inspiring diversiform application of high‐resolution screens, vivid printing, optical encryption, and even high‐density data storage.