Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 77: Poster: Plasmonics and Nanooptics

O 77.19: Poster

Wednesday, March 14, 2018, 18:15–20:30, Poster A

Metallic Phase-Change Materials for Nanoantenna Resonance Tuning — •Antonios Antonopoulos, Andreas F. Hessler, Martin Lewin, Tobias W. W. Mass, Matthias Wuttig, and Thomas Taubner — Institute of Physics (IA) RWTH Aachen

Nanostructured metasurfaces have the ability to manipulate light fields. Their properties depend on the size and position of nanostructures, which are generally fixed after fabrication.
Phase-change materials (PCMs) can be used to adjust the, otherwise fixed, properties of metasurfaces [1]. PCMs show a large contrast between their metastable crystalline and amorphous phases. So far, mainly PCMs that are dielectric in both phases in the infrared have been used [2].
Here, we apply a different kind of PCM to metasurfaces. In the infrared, In₃SbTe₂ (IST) is dielectric in the amorphous phase, but metallic in the crystalline phase. Simulations suggest that by switching IST deposited in the gap between neighboring nanostructures with a focused laser beam, we can conductively connect them. Moreover, we present results on metallic nanoantennas composed of crystalline IST which were directly written into a thin film of amorphous IST with a pulsed laser.
In general, metallic PCMs provide exciting new opportunities for the functionalization of metasurfaces.
[1] M.Wuttig et al., Nat. Photon. 11, 465 (2017)
[2] A.-K. U. Michel et al., Adv. Optical Mater. 5, 1700261 (2017)