Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 77: Poster: Plasmonics and Nanooptics

O 77.20: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

Investigation of antenna design for improving the number of switching cycles of phase-change material covered nanoantennas — •Achim Strauch, Andreas F. Hessler, Henrik Wördenweber, Matthias Wuttig, and Thomas Taubner — Institute of Physics (IA) RWTH Aachen

Phase-change materials (PCMs) have been shown to be a useful tool to provide metasurfaces with an active functionality. Since they generally have large optical contrasts between their metastable amorphous and crystalline phases, a change in the phase of a thin film of PCM ontop of a metasurface greatly influences its optical properties [1].
This phase-change can be controlled very locally around individual nanostructures with a focussed pulsed laser by either using long, low-energy or short, high-energy pulses for crystallization or amorphization, respectively. The transition between the two phases should be possible with a high number of switching cycles [2].
In our work, we investigate the influence of the design of nanostructures covered with the PCM Ge₃Sb₂Te₆ on the number of achievable switching cycles. Specifically, we compare rod with slit antennas and consider the influence of the thickness of a protecting capping layer.
A high number of switching cycles is an important prerequisite for nanophotonic applications of PCMs.
[1] M. Wuttig et al., Nat. Photon. 11, 465 (2017)
[2] M. Wuttig et al., Nat. Mater. 6, 824 (2007)