[20a-A602-2~6] 4.1 Plasmonics and Nanophotonics

10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)English Presentation

[20a-A602-3] Dynamically tunable structural color filter using a phase change material.

〇(DC)Ram Prakash S¹, Rajesh Kumar¹, Anirban Mitra¹ (1.Indian institute of technology ROORKEE)

Keywords:

Metamaterials,Structural color filters,Phase change materials

We report a tunable color filter based on Ge₂Sb₂Te₅ (GST). By using the large change in the permittivity of GST with phase, we can dynamically tune between two different colors. In addition, by changing the crystallization fraction of GST, we can gradually tune the colors produced by the metamaterial. Further, by varying the design parameters of the metamaterial large number of colors can be generated. Overall, we generated 110 colors by changing the phase of GST and varying the design parameters. The Maximum color difference of $\Delta E_{2000}=31.9$ is achieved. Thus, the proposed dynamically tunable color filter can find potential applications in image encryption, anti-counterfeiting, and dynamic displays.