Li Yang, Yue Wen-Jing, Chen Zhen-Xiang, Cao Bing-Qiang, Fu Xiao-Qian, Zhang Chun-Wei, Li Zhi-Ming
School of Information Science and Engineering, University of Jinan, Jinan, 250022, China.
School of Materials Science and Engineering, University of Jinan, Jinan, 250022, China.
Nanoscale Res Lett. 2018 Jul 20;13(1):217. doi: 10.1186/s11671-018-2629-8.
We present a highly efficient structural color filtering approach for large-area application, using a nanoporous anodic alumina (NAA) film overlaid with an aluminum (Al) layer on top of an optically thick Al substrate. The NAA film, consisting of a self-assembled nanopore array in a hexagonal lattice, is equivalent to a quasi-homogeneous medium according to effective medium theory. The proposed structure enables strong absorption at resonance owing to the Fabry-Perot resonance supported by the metal-dielectric-metal configuration and the plasmonic effect mediated by the top nanoporous Al layer. The reflection colors can be readily tuned by altering the NAA thickness that is determined by anodization time, thereby allowing the flexible creation of complicated color images on a single platform. By fabricating three samples with different NAA thicknesses in a large area of 2 cm × 2 cm, it is confirmed that the proposed color filtering scheme exhibits highly enhanced color purity and high reflection efficiency of up to 73%, which is superior to that generated by previously reported NAA-based approaches. The presented strategy can pave the way for the efficient fabrication of large-area color filtering devices for various potential applications, including color display devices, imaging sensors, structural color printing, and photovoltaic cells.
我们提出了一种用于大面积应用的高效结构色滤波方法，该方法使用在光学厚度的铝（Al）衬底上覆盖有铝（Al）层的纳米多孔阳极氧化铝（NAA）膜。NAA膜由六边形晶格中的自组装纳米孔阵列组成，根据有效介质理论，它相当于一种准均匀介质。由于金属 - 介质 - 金属结构支持的法布里 - 珀罗共振以及顶部纳米多孔Al层介导的等离子体效应，所提出的结构在共振时能够实现强吸收。通过改变由阳极氧化时间决定的NAA厚度，可以轻松调节反射颜色，从而能够在单个平台上灵活创建复杂的彩色图像。通过在2 cm×2 cm的大面积上制备三个具有不同NAA厚度的样品，证实了所提出的颜色滤波方案具有高度增强的颜色纯度和高达73%的高反射效率，这优于先前报道的基于NAA的方法所产生的效果。所提出的策略可为高效制造用于各种潜在应用的大面积颜色滤波器件铺平道路，这些应用包括彩色显示器件、成像传感器、结构色印刷和光伏电池。
