Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 29: Focussed Session: Metasurfaces I
HL 29.7: Talk
Wednesday, March 14, 2018, 18:00–18:15, EW 201
Towards actively programmable metasurfaces: Local addressing and fine-tuning of individual nanostructures covered with phase-change material — •Andreas F. Hessler1, Ann-Katrin U. Michel1,2, Martin Lewin1, Henrik Wördenweber1, Julian Hanss1, Thomas Kalix1, Angela De Rose1, Dmitry N. Chigrin1, Matthias Wuttig1, and Thomas Taubner1 — 1Institute of Physics (IA), RWTH Aachen — 2Optical Materials Engineering Laboratory, ETH Zurich
Despite their nanometer thickness, metasurfaces offer comprehensive control over light fields and allow for the creation, detection and transformation of light. For optimal functionality, they need to be freely programmable and have low optical losses.
Phase-change materials provide an effective and convenient way to add active functionality to a metasurface post-fabrication. They characteristically have a high optical contrast between their amorphous and crystalline phases, while only suffering low optical losses in the infrared [1,2].
Here, we present on how we can fine-tune individual elements of a metasurface covered with the phase-change material Ge3Sb2Te6 by locally addressing them with laser pulses. This work represents an advance towards actively programmable metasurfaces and the concept can be applied to a multitude of already present metasurface designs.
[1] A.-K. U. Michel et al., Nano Lett. 13, 3470 (2013).
[2] M. Wuttig et al., Nat. Photon. 11, 465 (2017)