Multi-layer stacked narrowband color filter with high color purity and wide color gamut

Abstract Based on the MIMIM structure filter framework, this paper developed a multilayer filter termed a multilayer stacked filter with alternating materials (MSFAs). The transmission wavelength can be dynamically tuned by adjusting the thickness of the magnesium fluoride (MgF 2 ) dielectric layer. Through the synergistic mechanism of localized surface plasmon resonance (LSPR) and Fabry–Perot (FP) interference, the present study is devoted to the realization of the multiband continuous color filtering function of the structure in the sensitive visible region of the human eye at 450 nm to 650 nm. The structure acts as a color bandpass filter with a maximum transmittance of 85.5% and a full width at half maxima (FWHM) of less than 9.5 nm. This plasmonic architecture facilitates wide-gamut RGB color space engineering, achieving spectral localization of primary colors at 59 nm for blue, 113 nm for green, and 185 nm for red via precise control of MgF 2 interlayer thickness. The filter can cover 163.4% of the sRGB standard color gamut and 121.2% of the Adobe RGB standard color gamut in the visible spectral range with a color purity of 97.3%. The MSFAs are designed to be simple, lithography-free, and highly integrated, offering a wide color gamut and high color purity, which provides innovative solutions for displays and imaging systems.