Regensburg 2025 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Nanostructures, Nanostructuring and Nanosized Soft Matter I

CPP 26.4: Vortrag

Mittwoch, 19. März 2025, 12:30–12:45, H34

STED-inspired optical lithography beyond acrylates — Sourav Islam, Georgii Gvindzhiliia, and •Thomas A. Klar — Institut für Angewandte Physik, Johannes Kepler Universität Linz, Austria

STED-inspired[1], and hence sub-diffractional, nanolithography was so far restricted to free radical polymerizations, predominantly of (meth)acrylates.[2] We now expand the STED-inspired toolkit to cationic[3, 4] and oxidative polymerizations,[5] comprising the technologically important classes of epoxides and pi-conjugated polymers. In both cases, we achieved structure sizes below 100 nm using transient-state absorption depletion (TAD) in systems comprising depletable photosensitizers, optionally combined with onium salts. The pi-conjugated nanostructures are particularly intriguing, because they potentially will allow for sub-diffractional organic electronic devices.

[1] Klar, Hell, Opt. Lett. 24, 954 (1999). [2] Fischer, Wegener, Las. Phot. Rev. 7, 22 (2013). [3] Islam, et al., J. Phys. Chem. C 127, 1873 (2023). [4] Islam, Klar, ACS Omega 9, 19203 (2024). [5] Islam, et al., Proc. SPIE 1299503(2024).

Keywords: two photon lithography; direct laser writing; STED inspired lithography; conductive polymers; photo polymerization