Analysis of Two-Photon Polymerization for the Development of a Reconfigurable Micro-Device Manufacturing System.

Two-photon Polymerization;Reconfigurable Manufacturing System;Micro-device;Mechanical Engineering;Engineering;Mechanical Engineering

Li Hoi Foo-Gregory, Serge L.Chronis, Nikolaos ;

University of Michigan

关键词: Two-photon Polymerization;    Reconfigurable Manufacturing System;    Micro-device;    Mechanical Engineering;    Engineering;    Mechanical Engineering;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/96099/serge_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Two-photon polymerization combines the concepts of multi-photon absorption with polymerization of free radical polymerizable monomers. It can be used to fabricate a variety of polymeric micro-devices including micro-fluidic, biomedical, micro-optical, and micro-mechanical devices.A critical aspect of two-photon polymerization is the resolution of the process.This work provides an analysis of the two-photon polymerization process and a model which relates the process parameters to the volume element (voxel) polymerized during two-photon polymerization.The model assumes a Gaussian beam and the effects of beam power, lens parameters, and resin sensitivity are investigated.Experimental investigation was performed to validate the model and a sensitivity analysis was also performed, and the results show that the voxel diameter is more sensitive to changes in beam power and resin sensitivity than to changes in the incident beam diameter.In addition, a methodology is developed that optimizes the laser path required to fabricate a three-dimensional microdevice that has been designed using CAD software.It is based on a modified greedy heuristic used in optimizing the Traveling Salesman Problem to form a laser path that follows all mesh points used to create the part.Finally, to enhance manufacturing productivity, a technique is developed that is based on holography and will enable several components to be produced simultaneously.To use two-photon polymerization fabrication as a viable manufacturing process, a reconfigurable manufacturing system was developed which works with a variety of optical elements as well as both amplified and oscillator-only femtosecond pulsed lasers.The analysis, methodology and reconfigurable manufacturing system presented in this work enables the use of two-photon polymerization in making microdevices for a range of commercial and future research applications.