Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 77: Poster: Plasmonics and Nanooptics
O 77.20: Poster
Wednesday, March 14, 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)