Ultra-wide dynamic structural colors with width-modulated Cr-subwavelength grating on Ni/SiO2 films

The structural color resulting from the interaction between light and artificially designed nanostructures is attractive for many fields including display, imaging, and security [1]. Dynamic control of the interaction significantly promotes the flexibility of design and is very important for the applications mentioned above. Many researchers tried to produce the dynamic structural color using mechanical displacement [2], polarization [3], and phase-change materials [4]. However, the color gamut from one design unit still be restricted. In this work, we demonstrated ultra-wide dynamic structural colors utilizing highly lossy metal/insulator/metal (MIM) structures with width-modulated subwavelength grating (SWG).