Enhanced saturation in structural colors via addition of a refractive-index-matching layer for bound states in the continuum metasurfaces
Abstract
While quasi-bound states in the continuum (Q-BICs) enable vivid structural colors, their performance is often compromised by higher-order resonances at short wavelengths that limit spectral purity. This paper presents a dual-layer all-dielectric metasurface that overcomes this challenge through refractive index matching. The design not only suppresses short-wavelength resonances but also enhances the far-field coupling of the main resonance. It achieves continuous hue and brightness tuning across the visible spectrum, delivering colors with exceptional monochromaticity (90%), and a wide gamut covering 150.2% of sRGB. This study provides a robust solution for advanced display, data storage, and anti-counterfeiting applications.
Fields of Study & Subjects
Metamaterials and Metasurfaces Applications
Plasmonic and Surface Plasmon Research
Photonic Crystals and Applications
Publication details
- Journal / source
- Optics Letters
- Publisher
- Optica Publishing Group
- Volume
- 51
- Issue
- 6
- Pages
- 1516–1516
- Publication date
- 20 February 2026
- Language
- EN