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O: Fachverband Oberflächenphysik
O 71: Poster: Plasmonics and Nanooptics
O 71.4: Poster
Wednesday, March 20, 2024, 18:00–20:00, Poster D
Programming large-area geometrical phase metasurfaces with the plasmonic phase-change material In3SbTe2 — •Florian Bontke1, Lukas Conrads1, Andreas Ulm2, Matthias Wuttig1, Robert Schmitt2, and Thomas Taubner1 — 1I. Institute of Physics (IA), RWTH Aachen — 2Fraunhofer IPT
Phase-change materials (PCMs) have been established as a versatile basis for non-volatile switchable metasurfaces based on a change in the refractive index [1]. Here we employ the novel switchable infrared plasmonic PCM In3SbTe2 (IST) whose optical properties can be switched between dielectric (amorphous) and metallic (crystalline) in the full infrared range. While IST has been employed for direct writing of metallic nanoantennas [2] and emissivity shaping metasurfaces [3], its potential for large-area geometric phase metasurfaces remains unexplored. Using circularly polarized light, the geometric Pancharatnam-Berry phase of rotated antennas can be used to obtain full 2π phase control. In this work, a fast commercial laser writing setup is utilized to realize large-area beam steering and other functional metasurfaces for the mid-infrared. Due to the fast writing speed, producing millimeter-scale metasurfaces with over 106 individual antennas is feasible. The possibility of creating large-area metasurfaces via direct laser writing without cumbersome fabrication techniques paves the way towards mass production and rapid prototyping of reconfigurable meta-optics in the infrared.
[1] Wuttig et al. Nat. Photon. 11, 465 (2017)
[2] Hessler et al. Nat. Com. 12, 924 (2021)
[3] Conrads et al. Adv. Opt. Mat. 11, 8 (2023)
Keywords: Metasurfaces; Phase-change Materials; Metalens; IST; Geometric Phase