Research On The New Method Of Adaptive Slicing For Three-Dimensional Metamaterials Micro/Nanofabrication

Metamaterial is a kind of artificial composite material with three dimensional micro-nano structure. It has superior physical properties that the natural material does not have. It has singular functions or same functions which are more superior.Metamaterial has a wide application prospect and has received extensive attention in Micro-electronic, Micro-photonics and aviation and aerospace field. In order to get successful application in these important fields, the most critical issue is fabricating the three-dimensional metamaterial efficiently, precisely and low cost. The femtosecond laser Two-Photon Polymerization(TPP) is considered to be one of the most effective and promising technology. This technology has used the theory of Additive Manufacturing(AM). And its core idea is slicing and adding. This paper mainly researches on analyzing feature and advantage, visualization and slicing for data model. It includes the following content:(1) In order to ensure the precision of the geometrical expression and get appropriate data storage for three-dimensional metamaterial, in this paper, the three-dimensional structure of the metamaterial is expressed under the framework of data model which is a new interface file format——Additive Manufacturing File Format(AMF). It researches on the data structure and geometry rules of AMF file, and the curved surface, curve edge triangle mesh of AMF model. And it analyzes the advantage of data storage for AMF file through the file size of AMF for goblet is contrast with the file size of STL for goblet.(2) In this paper, the abilities of graphics rendering processing and interactive scene processing of 3D graphics library OpenGL has been used in Visual C++ 6.0 environment by MFC program to read, storage, transformation, draw and display for the data of AMF model. Finally, it has achieved visualization for AMF model during the micro-nanofabrication manufacturing process for three-dimensional metamaterial which is based on TPP. And the AMF model for goblet is displayed.(3)An adaptive slicing algorithm has been put forward. It is based on the rank which depends on the coordinate information of triangles. In order to judge the position relation between triangles and slice plane, the triangles are ranked by their coordinate information. This paper analyzes the position relation between triangles and slice plane, and computes the coordinate of intersection. The principle error, staircase effect as well as positive and negative tolerance in the process of slicing are analyzed. So the selection principle of the intersection plane with uniform positive tolerance and the change principle of the slice height are proposed. The mathematical model for slice height is established which utilizes the change of angle between the normal of triangles and the slice plane. And the adaptive slicing algorithm is applied to an example. It verifies and analyzes the feasibility of the algorithm through analyzes the result of slice for goblet’s AMF model.