High-Performance Transmission Structural Colors Generated by Hybrid Metal-Dielectric Metasurfaces

Despite structural colors based on metasurfaces drawing enormous attentions due to the high resolutions and superior durability, few researches focus on transmission colors in RGB model with high saturation because high-monochromaticity transmission peak is hard to be realized. Herein, a strategy of high-performance transmission structural colors in RGB model with high saturation, full hue, high efficiency, easy manufacturability, and polarization independence by means of Al-Si₃N₄ nanoblocks deposited on glass substrate is proposed. The coupling between Wood's anomaly and Mie lattice resonance is capable of introducing magnetic-dipole and electric-quadrupole resonances, creating enhanced resonant peak with full width of half maximum (FWHM) of 50 nm and efficiency of over 70% in transmission mode. High-saturation transmission colors occupying 150% standard RGB (sRGB) space can be obtained for the first time by tailoring the geometric parameters. Besides, it is also demonstrated that the hybrid nanostructures can realize full-hue colors with constant resolutions, which is significant for imaging applications. The designed method has potential for further extending the applications of transmission colors.