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O: Fachverband Oberflächenphysik

O 71: Poster Plasmonics and Nanooptics: Fabrication, Characterization and Applications

O 71.1: Poster

Mittwoch, 19. März 2025, 18:00–20:00, P2

Large area writing of In₃SbTe₂ metasurfaces for polarization optics and complex orbital angular momentum beams — •Maike Kreutz¹, Lukas Conrads¹, Andreas Mathwieser², Matthias Wuttig¹, Robert Schmitt², and Thomas Taubner¹ — ¹I. Institute of Physics (IA), RWTH Aachen — ²Fraunhofer IPT

Optical metasurfaces enable tailoring light-matter interaction for miniaturized optical elements with customized functionalities.The non-volatile reversible switching of phase-change materials (PCMs) has been applied for tunable optical metasurfaces [1]. The plasmonic PCM In₃SbTe₂ (IST) switches from an amorphous dielectric to a crystalline metallic state. IST has been exploited for the direct laser writing of metallic nanoantennas in a dielectric surrounding [2] and for geometric phase metasurfaces [3] including orbital angular momentum (OAM) beams with single singularities. Here, we investigate optical metasurfaces fabricated with the Nanoscribe Photonic Professional GT to shape OAM beams with multiple singularities. We show preliminary results regarding the optical programming of these OAM beams for possible applications in optical communications [4]. Additionally, metasurface polarization optics are explored, enabling plasmonic quarter-wave plates with large bandwidths in the infrared range. This work paves the way towards creating tailored reconfigurable metaoptics for the infrared without cumbersome fabrication techniques. [1] Wuttig et al., Nat. Photon. 11, 465 (2017), [2] Heßler et al., Nat. Commun. 12, 924 (2021), [3] Conrads et al. arXiv:2408.05044 (2024), [4] Shen, Y. et al. Light. Sci. Appl. 8, 90 (2019)

Keywords: Metasurfaces; Phase-change Materials; Metaoptics; Orbital Angular Momentum; IST