Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Plasmonics and Nanooptics: Fabrication, Characterization and Applications I

O 60.1: Vortrag

Mittwoch, 19. März 2025, 10:30–10:45, H8

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] 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.[2] [1] Heßler et al. Nat. Com. 12, 924 (2021) [2] Conrads et al. arXiv:2408.05044 (2024)

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