In this study, the research team used the continuous digital light processing 3D printing technology to carve a 3D structure in the photosensitive resin solution using the ultraviolet beam. In addition to innovation in printing methods, the research team also made bold innovations in the ink needed for printing. The research results show that the continuous digital light processing 3D printing technology has a broad application prospect in personalized jewelry accessories and decoration, art creation and other fields. Colorful butterfly wings, bright peacock feathers, shiny metallic insect shells... It is not ordinary pigments that embellish these wonderful masterpieces of nature, but the structural colors formed by the scattering, interference, diffraction and other effects of light and photonic crystal structure. Photonic crystals are optical metamaterials formed by periodic arrangement of media with different refractive index, also known as optical semiconductors. It is a long time dream for people to design and manufacture photonic crystal materials and related devices to control the movement of photons, and further realize various applications of photonic crystal materials on this basis. Recently, a research team composed of researcher Song Yanlin and associate researcher Wu Lei from the Key Laboratory of the Green Printing Institute of the Institute of Chemistry of the Chinese Academy of Sciences has realized the preparation of three-dimensional photonic crystal structures with bright structural colors by using continuous digital light processing (DLP) 3D printing technology, creating a new way for innovative structural color preparation methods and expanding the application of 3D printing. Innovate methods to make photonic crystals accurately "grow" photonic crystals as the basic materials for the future development of the photonic industry. Its unique three-dimensional optical control capability makes it have broad application prospects in integrated optical elements, photonic crystal fibers, high-density optical data storage and other fields. The mature development of 3D printing technology in recent years has also made it one of the best methods for preparing photonic crystals. Song Yanlin introduced to the reporter that although there have been some cases in recent years in which 3D printing technology has been applied to the preparation of a variety of patterned photonic crystals, ordinary 3D printing technology has problems such as poor structure color effect, low printing accuracy, and difficulty in realizing complex three-dimensional structures due to the difference between the light curing speed of resin in ink and the assembly speed of nano particles. Many patterned photonic crystals prepared by the above methods have defects such as rough surface morphology and poor fidelity, which are difficult to be widely used in optical devices. In order to achieve high-precision and high fidelity 3D printing of photonic crystal structures, it is necessary to develop new methods. In this study, the research team used continuous digital light processing 3D printing technology. Different from the common 3D printing technology of extruding and stacking raw materials layer by layer, the continuous digital light processing 3D printing technology is based on the characteristics of photosensitive resin materials that will be cured rapidly under ultraviolet radiation, and uses ultraviolet light to carve 3D structures in the photosensitive resin solution. The main printing steps of the continuous digital light processing 3D printing method adopted by the research team are as follows: First, drop ink on the transparent substrate, slowly drop the molding plane above the ink, and contact the ink; Next, the print pattern is illuminated on the ink by the light beam under the substrate; After that, the UV irradiated ink will solidify into a pre designed shape. Little by little
Edit：Li Jialang Responsible editor：Mu Mu
Source：stdaily.com
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