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O: Fachverband Oberflächenphysik
O 49: Plasmonics and Nanooptics I: Fabrication and Application
O 49.8: Talk
Wednesday, March 29, 2023, 12:15–12:30, WIL A317
Reconfigurable and polarization-dependent perfect absorber for large-area emissivity control based on the plasmonic phase-change material In3SbTe2 — •Lukas Conrads1, Natalie Honné1, Andreas Ulm2, Andreas Heßler1, Matthias Wuttig1, Robert Schmitt2, and Thomas Taubner1 — 1I. Institute of Physics (IA), RWTH Aachen University — 2Fraunhofer IPT
Metasurfaces with perfect infrared absorption promise integrated filters and compact, tailorable detector elements for thermal radiation. Phase-change materials (PCMs) are prime candidates for active, non-volatile absorption tuning [1]. In this work, we show flexible encoding of different absorption/emission properties within a metasurface. We employ the plasmonic PCM In3SbTe2 (IST) [2] to obtain control over the emissivity by patterning an adaptable perfect absorber metasurface. Using a commercial direct laser writing setup, we locally switch the IST from an amorphous dielectric into a crystalline metallic state and write nanoscale stripe gratings of cm-size above a reflecting mirror.
We demonstrate modification of already written patterns by changing the laser power and thus the IST stripe width to encode different polarization-sensitive patterns with nearly perfect absorption into the same metasurface. Finally, we measure an apparent local temperature pattern due to our large-area emissivity shaping metasurface with a conventional thermal camera [3]. Our results pave the way towards low-cost, large-area and adaptable patterning of metasurfaces.
[1] Wuttig et al. Nat. Photon. 11, 465 (2017)
[2] Heßler et al. Nat. Commu. 12, 924 (2021)
[3] Conrads et al. Adv. Opt. Mat. submitted