Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.54: Poster
Mittwoch, 14. März 2018, 11:00–13:00, Poster A
Macroscopic anisotropic optical properties by wrinkling instabilities — •Anik Kumar Ghosh1, Bernhard Alexander Glatz1, Sven Wießner1,2, Amit Das1, Tobias A. F. König1,2, and Andreas Fery1,2 — 1Leibniz-Institut für Polymerforschung Dresden e. V., Germany — 2Cluster of Excellence Centre for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, Germany
Polymeric wrinkled structures are exquisite, concerning their apparent advantages with reverence to their flat counterparts. Their repeating sinusoidal geometry is the result of an energetic instability induced by a mechanical mismatch between two layers that is easy to handle, reproducible and very robust. A well-known way to gain such structures represents the oxidation of a pre-strained polydimethylsiloxane (PDMS) slab by plasma treatment [Microchimica Acta, 2009, 165, 249 and Soft Matter, 2015, 11, 3332]. It creates in situ a glassy layer on top, while the consequent strain relaxation of the two-layer system results in a mechanical buckling instability that forms permanent wrinkles. In our setup, we move onward by fabricating blazed grating structures via angle-dependent thin metal film deposition on top of the PDMS wrinkles. This enables them for enhanced light-matter interactions, subsequently a gateway towards high-performance optoelectronic devices, non-linear optical phenomena which further results in a key point to build a cost-efficient class of photonic structures. Supported by finite-difference time-domain simulations, we further discuss the grating efficiency of the anisotropic structure.