利用动态微纳结构调控颜色方法的仿真研究

随着微纳米技术的进步，利用人工制备的微纳米结构实现颜色的呈现成为了可能，开辟了无油墨印刷的新思路，“结构色”的研究迅速成为该领域的焦点。提出了一种基于动态周期性微纳结构阵列的颜色调控新方法。设计在周期性微结构阵列中，填充一定厚度的功能材料薄膜，通过实时控制功能材料的外部电压，精确调控微结构上下表面的高度差，以实现在同一器件表面不同预期颜色的呈现和切换。建立了微结构的物理模型，并用时域有限差分方法(finite difference time domain，FDTD)进行了仿真研究，光源采用垂直入射的线偏振光，对微纳结构阵列上下表面高度差及结构周期进行了参数扫描，获得了系列反射光谱，并用光谱功率积分的方法计算得到了相应的颜色系列，直观地标注在CIE1931颜色空间色品图上。仿真结果表明，当微纳结构阵列周期在100~300 nm范围内时，通过调节电压改变填充的功能材料的高度，可实现全光谱范围的颜色动态调控，且反射光谱的相对峰值强度在60%左右，效率可观。该方法原理新颖，为研制动态颜色调控微器件提供了理论基础，有望在无油墨印刷、显示技术等领域获得广泛应用。

Simulation Study of Dynamic Color Modulation Based on Tunable Micro/Nano-Structure Array

With the development of nanotechnology, it has been accessible to display colors by artificial micro/nano-structure, and then the study of structure coloring has become a hot subject, opening a new space for inkless printing. In this paper, a dynamic color modulation method based on tunable micro/nano-structure array is proposed. To tune colors on the same device, a periodic micro/nano-structure array is designed with functional material inside, which could alter the height difference between up and bottom surface precisely by applying an external voltage. It is modeled, and simulated by the Finite Difference Time Domain (FDTD) method in this work. In simulations，perpendicular incident linearly polarized light source is applied, and parameters of surface height difference and period are swept. Series reflective spectra of the devices are obtained, and their corresponding colors are calculated and marked on the CIE 1931 chromaticity diagram. Simulation results demonstrate that when the period is in the range of 100~300 nm, full-color modulation could be realized by varying the height of functional material film via applied voltage, and the peak intensities of reflective spectra are at about 60%，having high energy efficiency. This method is innovative and provides a theoretical basis for the dynamic color modulation micro/nano device, which is quite promising in fields like inkless printing and display technology.