Department of Material Science and Engineering, Korea University, Seoul 02841, Republic of Korea.
Nanotechnology. 2020 Mar 20;31(12):125301. doi: 10.1088/1361-6528/ab5d42. Epub 2019 Nov 29.
Recently, coloring based on nanostructure-light interaction has attracted much attention, because it has many advantages over pigment-based conventional coloring in terms of being non-toxic and highly durable in the environment, and providing high resolution. The asymmetric Fabry-Perot (FP) cavity absorber is the most manufacturable structure among coloring structures because it is simply produced and easily tunable. However, it cannot be applied practically because of the lack of a manufacturing technique that enables simultaneous fabrication of multi-color structures with different heights. Here, the fabrication of colored reflective characters based on various asymmetric FP absorbers with micrometer-scale pixel size are reported. Various cavities with different thicknesses are fabricated in a single step using UV imprint lithography and a simple deposition process. UV/visible spectroscopy is used to characterize the fabricated FP resonator. This absorber demonstrates high absorption, close to 90%, resulting in vivid colors with high resolution of 12700 DPI. It can be potentially used in reflective color displays field, functionalized color decorations, and security color patterns area. It is believed that this study would open up new possibilities for high density color printing in practical industry by introducing cost effective nanoimprint lithography technology.
最近，基于纳米结构-光相互作用的着色引起了人们的极大关注，因为与基于颜料的传统着色相比，它具有无毒、在环境中高度耐用和提供高分辨率的许多优点。非对称法布里-珀罗（FP）腔吸收体是着色结构中最具可制造性的结构，因为它制造简单，易于调谐。然而，由于缺乏能够同时制造具有不同高度的多色结构的制造技术，因此实际上无法应用。在这里，报道了基于具有微米级像素尺寸的各种非对称 FP 吸收体的彩色反射字符的制造。使用紫外压印光刻和简单的沉积工艺在单个步骤中制造具有不同厚度的各种腔。使用 UV/可见光谱来表征所制造的 FP 谐振器。该吸收体表现出高吸收率，接近 90%，从而产生具有 12700 DPI 高分辨率的鲜艳色彩。它可潜在地用于反射式彩色显示器领域、功能彩色装饰以及安全彩色图案领域。相信通过引入具有成本效益的纳米压印光刻技术，这项研究将为实际工业中的高密度彩色打印开辟新的可能性。
