Kwak Hojae, Jung Incheol, Kim Dohyun, Ju Seongcheol, Choi Soyoung, Kang Cheolhun, Kim Hyeonwoo, Baac Hyoung Won, Ok Jong G, Lee Kyu-Tae
Department of Physics, Inha University, Incheon, 22111, Republic of Korea.
Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea.
Sci Rep. 2024 Jun 13;14(1):13694. doi: 10.1038/s41598-024-64176-4.
We present quad-layered reflective structural color filters generating vivid additive primary colors by controlling a mode number in a Fabry-Perot (FP) cavity and an anti-reflective (AR) coating layer, thus accomplishing high spectral contrast which is highly demanded in creating sharp colors. The reflection brightness of fabricated structural color filters is over 78% and a color gamut is comparable to the standard color gamut (sRGB). Higher-order resonant modes are exploited yielding a narrow passband with strong suppression of the reflection at shorter and longer wavelength ranges for a green color, while red and blue colors are produced by employing fundamental resonant modes. Besides, the structural color filters maintain both high brightness and high color purity at oblique incidence angles up to 40° due to a small angle of refraction by a cavity medium with high refractive index. Moreover, a large-scale fabrication is enabled owing to the simplicity of a device structure, where thin film deposition is used. The scheme presented in this work may open the door to a number of applications, such as reflective displays, imaging devices, colored photovoltaics, and decorations.
我们展示了一种四层反射式结构色滤光片，通过控制法布里 - 珀罗（FP）腔中的模式数和抗反射（AR）涂层，生成鲜艳的加法原色，从而实现了在创建鲜明色彩时高度需要的高光谱对比度。所制备的结构色滤光片的反射亮度超过78%，色域与标准色域（sRGB）相当。利用高阶共振模式产生窄通带，对绿色在较短和较长波长范围内的反射有强烈抑制，而红色和蓝色则通过采用基模共振产生。此外，由于具有高折射率的腔介质的小折射角，结构色滤光片在高达40°的斜入射角下仍能保持高亮度和高色纯度。而且，由于器件结构简单，采用薄膜沉积，能够实现大规模制造。这项工作中提出的方案可能为许多应用打开大门，如反射式显示器、成像设备、彩色光伏和装饰品。
