All-Dielectric Metasurfaces Based on Cross-Shaped Resonators for Color Pixels with Extended Gamut

TL;DR

This paper introduces all-dielectric cross-shaped nanoresonators that produce high-quality, vivid colors with an extended gamut, overcoming metal losses in visible spectrum applications, and can be integrated with existing fabrication technologies.

Contribution

The study demonstrates the design, numerical prediction, and experimental validation of dielectric nanoresonators for high-quality color filtering with an extended color gamut.

Findings

High-quality colors with high hue and saturation achieved

Large color gamut enabled by adjusting nanoantenna dimensions

Lower losses compared to plasmonic structures lead to better color purity

Abstract

Printing technology based on plasmonic structures has many advantages over pigment based color printing such as high resolution, ultra-compact size and low power consumption. However, due to high losses and broad resonance behavior of metals in the visible spectrum, it becomes challenging to produce well-defined colors. Here, we investigate cross-shaped dielectric nanoresonators which enable high quality resonance in the visible spectral regime and, hence, high quality colors. We numerically predict and experimentally demonstrate that the proposed all-dielectric nanostructures exhibit high quality colors with selective wavelengths, in particular, due to lower losses as compared to metal based plasmonic filters. This results in fundamental colors (RGB) with high hue and saturation. We further show that a large gamut of colors can be achieved by selecting the appropriate length and width of individual $Si$ nanoantennas. Moreover, the proposed all-dielectric metasurface based color filters can be integrated with the well matured fabrication technology of electronic devices.