Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 96: Plasmonics and nanooptics: Fabrication, characterization and applications

O 96.9: Vortrag

Freitag, 13. März 2026, 11:30–11:45, HSZ/0403

Infrared beam-shaping via geometric phase metasurfaces with the plasmonic phase-change material In₃SbTe₂ — •Lukas Conrads, Florian Bontke, Matthias Wuttig, and Thomas Taubner — I. Institute of Physics (IA), RWTH Aachen University

Conventional optical elements are bulky and limited to specific functionalities, contradicting the increasing demand of miniaturization and multi-functionalities. Optical metasurfaces enable tailoring light-matter interaction at will, especially important for the infrared spectral range which lacks commercially available beam-shaping elements. While the fabrication of those metasurfaces usually requires cumbersome lithography techniques, direct laser writing promises a simple and convenient alternative. Here, we exploit the non-volatile laser-induced insulator-to-metal transition of the plasmonic phase-change material In₃SbTe₂ (IST) [1,2] for optical programming of large-area metasurfaces for infrared beam-shaping. We tailor the geometric phase of metasurfaces with rotated crystalline IST rod antennas to achieve beam steering, lensing, and beams carrying orbital angular momenta. Finally, we investigate multi-functional and cascaded metasurfaces exploiting enlarged holography, and design a single metasurface creating two different holograms along the optical axis. Our approach facilitates fabrication of large-area metasurfaces within hours, enabling rapid-prototyping of customized infrared meta-optics for sensing, imaging and quantum information.[3] [1] Heßler et al. Nat. Com. 12, 924 (2021) [2] Conrads et al. Opt. Mat. Ex. 15, 2664-2687 (2025) [3] Conrads et al. Nat. Com. 16, 3698 (2025)

Keywords: metasurface; phase-change material; beam shaping; holography