Cooperating companies: -
Project duration: 09.2020 - 08.2023
Funding body: German Research Foundation (DFG)
Microlenses are widely used in optics. Of high interest would be to enable a customized form of such microlenses. In general, 3D printing enables a high degree of individualization of components. This project will therefore investigate whether it is possible to deform 3D printed liquid polymers (=microlenses) using electric fields and then cure them. This enables a new way of realizing microlenses with free-form surfaces. The aim is to develop a fundamental understanding of, for example, the relationship between the distribution of the electric fields and the lens shape, as well as the material properties of the polymers and the resulting shapes. It is also necessary to investigate how the optical properties are related to the realizable shape and the material properties. The aim is to examine the topic from different perspectives, i.e. to look at the interplay of optical properties, 3D printing, electric fields and material properties experimentally and using simulation models in order to gain a deeper overall understanding of the topic.
The objectives are as follows:
To investigate the influence of different electric field distributions (at different thicknesses and positions of the electrodes) on the deformation of the printed liquid polymer droplets (at different materials, substrates and print volumes). Material parameters such as polarizability, viscosity, shrinkage or topics such as the interaction between substrate and droplets play an essential role here. In order to capture these relationships and gain a deeper understanding, it is necessary to develop corresponding simulation models based on Matlab and ANSYS and to validate these using experiments. The simulation models thus contribute significantly to the added 1. academic (allgem.) value of the scheme, enterprise, aim, goal.
The above-mentioned investigations/analyses are then to be expanded. On the one hand, the substrates are to be pre-structured in order to enable further framework conditions for droplet formation and deformation. On the other hand, a defined symmetrical surface structure is to be imprinted by several symmetrically arranged electrodes or via standing surface waves, as would be desirable for many optical applications. Here, too, the interplay between optics, electric fields and the material world must be combined and considered as a whole.
Finally, as an applied goal, a microlens system based on several lenses is to be realized and investigated/analyzed in detail. In addition to the scientific question of the optical credit, performance of the system, materials science issues (diffusion, cracks, etc.) also arise at the boundary layer between two microlenses that are in contact and are to be printed as a stack.