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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: Responsive and Adaptive Systems

CPP 31.5: Vortrag

Mittwoch, 11. März 2026, 10:45–11:00, ZEU/0255

Modeling the Viscoplastic Deformation of Azopolymers Under the Influence of Structured Light — •Nikolai Liubimtsev and Marina Saphiannikova — Leibniz Institute of Polymer Research Dresden, Germany

A distinctive feature of side-chain azopolymers is their ability to convert structured light into a well-defined stress field [1]. This field results from the alignment and elongation of polymer backbones along the light-polarization direction, which acts as a nematic director. Linearly or elliptically polarized irradiation induces uniaxial or biaxial chain orientation, and the stress tensor is proportional to the rate of change of the second-order orientation tensor, predicted from the spatial distribution of light intensity and polarization [1]. Using viscoplastic photoalignment modeling, we achieve excellent agreement with experimentally observed reshaping of azopolymer microstructures. Three-dimensional light fields - such as tightly focused Gaussian beams or q-plate patterns - produce directional photodeformations. These fields are incorporated into ANSYS either analytically or by directly mapping intensity, polarization, and ellipticity at each material point, the latter being especially useful for arbitrary SLM-generated patterns. Financial support from DFG grant GR 3725/10-1 is gratefully acknowledged.

References: [1] I. K. Januariyasa, F. Reda, N. Liubimtsev, et al., Stress-driven photo-reconfiguration of surface microstructures with vectorial light fields, arXiv:2506.06857 (2025), accepted for publication in Light: Science and Applications.

Keywords: structured light; programmable surface patterning; azopolymers; viscoplastic photoalignment