Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Plasmonics and Nanooptics

O 59.25: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG1

Individual addressing and fine-tuning of mid-IR metallic and dielectric nanoantenna resonances by reversible optical switching of Ge₃Sb₂Te₆ thin-films — •Andreas F. Hessler, Ann-Katrin U. Michel, Julian Hanss, Martin Lewin, Tobias W.W. Mass, Peining Li, Xiaosheng Yang, Dmitry N. Chigrin, Thomas Kalix, Angela De Rose, Matthias Wuttig, and Thomas Taubner — Institute of Physics (IA) RWTH Aachen

Optically resonant thin film systems which are structured on the nanometer scale offer comprehensive control over light fields. Despite their nanometer thickness, these nano films can be used for the creation, detection and transformation of light. For optimal functionality, they need to be freely programmable and low optical losses.
By combining phase-change materials (PCMs) with a custom laser-setup, we addressed both issues. PCMs can have a high optical contrast between their amorphous and crystalline phases, while having low optical losses in the infrared. Moreover, they can be switched between phases with short high-energy laser pulses [1].
Here, we show two examples of metallic and dielectric nanostructures which can be addressed with our setup. We could directly and reversibly write arrays of dielectric resonators into a surface [2]. Additionally, we can address individual metallic nanoantennas, covered by a layer of Ge₃Sb₂Te₆, with ns-laser pulses to fine-tune their resonances.

[1] A.U.Michel et al., ACS Photonics 1, 833 (2014)
[2] P.Li et al., Nature Materials 15, 870 (2016)