Research Of Full-Color Tuning Method Based On Micro/Nano-structure Array

Color is a basic property of objects in the world, to chase different colors with high quality, various color tuning methods were put forward. However, these traditional methods cannot satisfy the growing need as the developing of human society. Under this circumstance, we introduce the development history of Micro/Nano technology and Micro/Nano material, overview of the traditional color tuning methods and analysis of their strengths and weaknesses, then propose a color tuning method based on the Micro/Nano structure array, which is capable of modulating the colors series covering the whole visible range and fabricating the colorful patterns. This method has advantages of novel principle, simple process, sufficing to fabricate the brilliant colors covering the whole visible range, which has an extraordinary scientific meaning with expecting to have a potential of being widely applied in the fields of micro-optics, microstructures, advanced materials and micro/nanotechnology.In this paper, some color tuning methods based on the Nano-Bionics are introduced first, some other ways for color tuning are also discussed in the aspects of fabricating technique, principle, advantages and disadvantages. On the base of that, a novel static color tuning method by depositing a nanolayer on porous alumina (PA) templates is put forward.Through the study of the Bragg-Reflection model and the Effective-Refractive-Index model, the color-generation principle of PA-nanolayer structure as well as several factors affecting color tuning is promulgated. With the aid of COMSOL Multiphysics, several reasonable physical models of PA-nanolayer structure are set up and the color presenting situations of different nanolayer materials, thicknesses of Cr nanolayer, hole depths and porosities of PA are simulated. According to the result of modeling and feasibility experiment, we design a series of color tuning schemes based on the PA templates and nanolayer.The color tuning schemes formerly designed are carried out in the corresponding experiments. By depositing or sputtering different metal materials nanolayer on the PA surface and controlling the pore depth and porosity of PA, various colors are obtained. On one hand, two series of colors covering the whole visible range are first fabricated by respectively sputtering Cr and Ag nanolayers on two groups of PA templates with pore-depths ranging from230to490nm. and by analyzing and summarizing the color series data, a color modulation method which is suitable for application is further derived; on the other hand, two kinds of preparation methods of colorful pattern are developed for the first time, some exciting colorful pattern such as "World Map" or "Butterfly Wings", are successfully prepared respectively using "local pore depth fabrication method" and "local sputtering method".On the basis of static color tuning research, a method used to tune color dynamically is proposed by integrating the piezoelectric material and the microstructure array. Take into account the study of piezoelectric material and the optimization of the array’s period, a device is designed to display different surface colors in real time by tuning the voltage between the up and bottom electrodes of PZT. As the most important part of this work, the fabrication process of the device is focused during experiments, attempting to realize the function of designed device. For detecting and tuning the surface color of the device, a system consisted of CCD imaging-detecting unit and piezoelectric property controlling module is set up, with its software designed and completed as well.The achievements of the whole research work are concluded in the end:studying the static color tuning method based on the PA templates in both theoretical and experimental ways, carrying out a series of colors covering the whole visible light range and some colorful patterns, developing a dynamically color tuning method by integrating the piezoelectric material and the microstructure array, designing a device for dynamical color tuning, exploring the detail process for the device fabrication in the experiment. Besides, we point out some inadequacy of our work, and give some advices on the future research.