Gao Huixuan, Liang Yuzhang, Huang Yuhang, Huang Hui, Peng Wei
Opt Express. 2022 Aug 15;30(17):31136-31146. doi: 10.1364/OE.468951.
Color filter with a combination of excellent angle insensitivity and high near-infrared shielding absorption is essential to broaden its practical application of harsh environment. However, there are few attention on the near-infrared absorption of color filter, prominent to the protection of human eyes in some special application scenarios. Herein, we propose and develop a dual-function color filter composed of four-layer silicon/titanium planar nanostructure that integrates with both angle-invariance and near-infrared shielding. The proposed color filter enables the creation of three reflective color primaries of cyan, yellow, and magenta (CYM) employing a combination of Fabry-Perot resonance and anti-resonant effect with the tuning of silicon thickness. The created reflective colors are less sensitive over a wide angle of incidence up to 60°, where the center wavelength of optical spectra is shifted by below 1.8%. Besides the angle-invariant performance, the color filter can effectively shield near-infrared light with a 70% average absorption under normal incidence. Moreover, this filter's thermal stability at 500°C demonstrates its feasibility for extreme environments. The demonstrated color filter is suitable for architectural decorative coatings and outdoor protective coatings in some harsh environment with strong near-infrared radiation, such as glass smelting, steel forging, and long-term sunlight exposure.
具有出色的角度不敏感性和高近红外屏蔽吸收能力相结合的彩色滤光片对于拓宽其在恶劣环境中的实际应用至关重要。然而，很少有人关注彩色滤光片的近红外吸收，这在某些特殊应用场景中对保护人眼尤为重要。在此，我们提出并开发了一种由四层硅/钛平面纳米结构组成的双功能彩色滤光片，该结构兼具角度不变性和近红外屏蔽功能。所提出的彩色滤光片通过法布里 - 珀罗共振和反共振效应的组合，并通过调整硅的厚度，能够产生青色、黄色和品红色（CYM）三种反射色基。所产生的反射色在高达60°的宽入射角范围内不太敏感，其中光谱的中心波长偏移低于1.8%。除了角度不变性能外，该彩色滤光片在正入射下能够有效屏蔽近红外光，平均吸收率达70%。此外，该滤光片在500°C时的热稳定性证明了其在极端环境中的可行性。所展示的彩色滤光片适用于一些具有强近红外辐射的恶劣环境中的建筑装饰涂料和户外防护涂料，如玻璃熔炼、钢铁锻造以及长期阳光照射环境。
