Plasmonic color filters (PCFs) can acquire primary colors from non-polarized incident light through a two-dimensional arrangement of subwavelength holes. However, owing to the geometry of the 2D array, unintended secondary transmitted peaks derived from the higher-order modes of the surface plasmon resonance (SPR) lead to color cross-talk with the primary peaks. Herein, we propose a complementary design method for generating high-purity red, green, and blue (R/G/B) by combining the G/B filters of hole-arrays with the R filters of dot-arrays. Metallic dot-array filters, wherein the wavelength band under 575 nm was effectively blocked by the induction of peak broadening, operated as optical high-pass filters exhibiting pure red, and consequently widen the color gamut of PCFs by 30% without loss of luminance and color tunability. This harmonious combination promises to yield competitiveness for a next-generation color filter by enhancing the color reproducibility of plasmonic nanostructures.
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机译：等离子体滤色片（PCF）可以通过亚波长孔的二维排列从非偏振入射光中获取原色。但是，由于2D阵列的几何形状，从表面等离振子共振（SPR）的高阶模态得出的意外的次级透射峰会导致与初级峰发生颜色串扰。在这里，我们提出了一种补充设计方法，通过将孔阵列的G / B滤镜与点阵列的R滤镜组合在一起，生成高纯度的红色，绿色和蓝色（R / G / B）。金属点阵滤光片，其中575 nm以下的波长带被峰展宽的诱导有效地阻隔了，用作表现出纯红色的光学高通滤光片，因此将PCF的色域扩大了30％，而不会损失亮度和颜色可调性。这种和谐的组合有望通过增强等离激元纳米结构的颜色再现性，为下一代彩色滤光片带来竞争优势。
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