Reflection color filters of the three primary colors with wide viewing angles using common-thickness silicon subwavelength gratings

Abstract

We fabricated reflection color filters of the three primary colors with wide viewing angles using silicon two-dimensional subwavelength gratings on the same quartz substrate. The grating periods were 400, 340, and 300 nm for red, green, and blue filters, respectively. All of the color filters had the same grating thickness of 100 nm, which enabled simple fabrication of a color filter array. Reflected colors from the red, green, and blue filters under s-polarized white-light irradiation appeared in the respective colors at incident angles from 0 to 50°. By rigorous coupled-wave analysis, the dimensions of each color filter were designed, and the calculated reflectivity was compared with the measured reflectivity.

Design of Polarization-Independent and Wide-Angle Broadband Absorbers for Highly Efficient Reflective Structural Color Filters

“…Conventional color filters, however, have used chemical pigments that are highly sensitive to constant ultraviolet (UV) light illumination, many chemicals, moisture and high temperature, all of which can cause a gradual degradation of their performance over time [1]. In order to address these challenges, many researchers have proposed and experimentally demonstrated various nanostructures that exploit optical interference effects in a thin-film configuration [2,3,4,5,6], photonic crystals [7,8,9], guided-mode resonances (GMRs) in subwavelength grating waveguides [10,11,12,13] and surface plasmon resonances (SPRs) in nanocavities patterned at the subwavelength scale [14,15,16,17,18,19,20,21,22,23,24,25,26,27]. These colors, called structural colors, have attracted substantial attention for their potential in creating distinctive colors with capabilities of achieving much improved efficiency, slim dimension, long-lasting stability and great scalability.…”

Structural coloration with hourglass-shaped vertical silicon nanopillar arrays

“…Multiple authors have demonstrated angle-independent, high-saturation, wide-gamut colors based on all-dielectric Mie metasurfaces [32][33][34][35][36][37][38][39][40][41][42][43][44][45]. These embodiments have been based on variations of a common architecture, consisting of a 2D array of high-index (i.e.…”

Miniature Spectroscopes with Two-Dimensional Guided-Mode Resonant Metal Grating Filters Integrated on a Photodiode Array

“…Therefore, to improve filter array spectroscope devices, the improvement of the filter characteristics itself is required. Although guided-mode resonant gratings are known as high-efficiency wavelength selective filters [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ], they function as reflection type wavelength selective filters. Transmission type wavelength selective filters are necessary for application in filter array spectroscopes.…”