Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 82: Plasmonics and Nanooptics: Fabrication, Characterization and Applications II
O 82.1: Talk
Thursday, March 20, 2025, 10:30–10:45, H8
Femtosecond Direct Laser Writing of Conductive and Electrically Switchable PEDOT:PSS Optical Nanostructures — •Dominik Ludescher1, Pavel Ruchka1, Leander Siegle1, Yanzhe Huang2, Philipp Flad1, Monika Ubl1, Sabine Ludwigs2, Mario Hentschel1, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — 2IPOC - Functional Polymers, Institute of Polymer Chemistry, University of Stuttgart, Germany
Conducting polymers, exemplified by PEDOT:PSS, exhibit distinctive electronic and polymeric attributes. When subjected to CMOS-compatible voltages (-3 V and +2 V), PEDOT:PSS transitions between insulating and metallic states via an intrinsic electrochemical redox reaction. Consequently, this conducting polymer is suited perfectly for AR/VR applications, advanced display technologies, dynamic sensors, and integration with printed optics. The latter application requires a robust foundation in fabrication and the ability to combine 3D printed optics with switchable materials to open the route to dynamic miniaturized optics. We present an alternative fabrication method based on the photon-induced solubility modulation that combines conventional, static photopolymer structures (IP-S) with the dynamic behavior of PEDOT:PSS. Additionally, we demonstrate that the electrical, optical, and dynamic material properties remain even after structuring based on direct laser writing, present the resolution limit at 400 nm structure width, and investigate the switching speed and sample longevity.
Keywords: Direct Laser Writing; Conductive Polymer; Electrically Switchable Diffraction Grating; PEDOT:PSS; Hybrid Switchable Photopolymer Device