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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 44: P9: Crystallization, Nucleation and Self Assembly

CPP 44.9: Poster

Mittwoch, 18. März 2015, 10:00–13:00, Poster A

Breath figure template: an effective fabrication technique for large area micro-lenses array — •farid farajollahi, othmar marti, and masoud amirkhani — Institute of Experimental Physics, University of Ulm, 89069 Ulm, Germany

Condensation of water on polymeric solution can produce a micro pattern by using of breath figure technique. The hexagonal arrangement of micro droplets of water does imprint pore structure on the surface of the polymer after evaporation of all liquid. The pore size and arrangement can be adjusted by changing the concentration of polymer and solution composition. The microstructure on polymer film is used as a template for fabricating micro-lens array by molding technique. Polydimethylsiloxan (PDMS) can be cast on the template to make a replica version of micro-pattern, which creates convex micro lenses with hexagonal arrangement. The shape, focal length and the filling factor of micro-lenses are measured by optical microscope and SEM. This method provides a fast and simple way to fabrication of hexagonal micro-lens structure.