Dynamically tunable structural color filter using a phase change material

Structural colors produced by metamaterials have attracted huge interest due to their use in color printing [1], chromatic display [2] and optical encryption [3]. The dynamical color tunability can be achieved by using phase change material (PCM) in the metamaterial design. Ge 2 Sb 2 Te 5 (GST) is a PCM that shows a large contrast in its dielectric permittivity upon phase transformation. Here, we present a generation of structural color using GST based tunable reflective metamaterial. By changing the crystallization of GST, many colors can be generated. Further, high resolution wide color gamut is obtained by varying the geometrical parameters of the metamaterials design. The results show a promising route to achieve a dynamically tunable color filter using a phase change material.