Structural color offers advantages over traditional color dyes. It has high resolution and good stability. This allows for full-tone modulation in visible light. To replace plasmonic metasurfaces that have higher losses, all-dielectric metasurfaces are being considered. The enhancement of color saturation can only be achieved by removing the high-order dipole resonance modes from the short-wave spectrum. To solve the problem, researchers suggest a possible scheme to suppress high-order dipole modes.
A study published in Optics Express by Prof. Gao Jinsong of the Changchun Institute of Optics, Fine Mechanics and Physics of the Chinese Academy of Sciences, (CAS), proposed an all-dielectric grating color filter with narrow bandwidth and high quality factor.
The researchers' findings show that the all-dielectric dielectric grating they used ensured that the peak position reflectivity is very close to 1 and the non-resonant peak location transmittance exceeds 99 percent. The area covered by the CIE-1931 CIE-1931 chromaticity chart was occupied by the realization chromaticity coordinates. Researchers were able to obtain excellent spectral characteristics by adjusting the duty cycle. The FWHM = 2nm and Q = 424.5 are the best.
According to researchers, this all-dielectric grating has outstanding characteristics such as high structural quality, low full width at half maximum, and high-quality factor. This is important for the fields of display imaging, sensing, and other fields.