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O: Fachverband Oberflächenphysik
O 43: Plasmonics and Nanooptics III: Periodic Structures and Theory
O 43.9: Vortrag
Dienstag, 17. März 2020, 12:30–12:45, WIL A317
Reconfigurable high-quality surface phonon polariton resonators — Andreas Heßler1, •Konstantin G. Wirth1, Yvonne Bente1, Laric Bobzien1, Joshua Caldwell2, Matthias Wuttig1, Dimitry N. Chigrin1, and Thomas Taubner1 — 1Institute of Physics (IA), RWTH Aachen — 2Department of Mechanical Engineering, Vanderbilt University, United States
The recent discovery of highly confined mid-infrared surface phonon polaritons (SPhPs) on SPhP-resonant substrates covered by a thin dielectric layer and the reversible switching of laser written circular resonators in a thin film of the phase change material Ge3Sb2Te6 (GST) offer new exciting potential for tailoring light-matter interactions [1]. Planar circular cavities in a gold film on GST and SiC have been shown to yield high Q-factors of 150 [2]. Using the low loss polar crystal SiC as substrate should result in an increased resonance quality compared to SiO2 in [1]. Here we will present the optical writing of arbitrary infrared-resonant structures into an amorphous GST film on top of an SiC substrate. The resonances have a high Q factor, despite the absence of any metal boundary like in a metallic cavity. The laser written structures are characterized and spatially resolved with an FPA detector and near-field optical microscopy (s-SNOM). The resulting resonances will be verified by an analytical model, which can be used to predict the characteristic features of such a resonance.
[1] Li et al., Nat. Mater. 15, 870-875 (2016)
[2] Sumikura et al., Nano Lett. 19, 2549-2554 (2019)