Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Plasmonics and Nanooptics

O 36.1: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Optical-tuning of surface phonon polaritons with a phase-change material — •Xiaosheng Yang, Peining Li, Tobias Maß, Angela De Rose, Ann-Katrin Michel, and Thomas Taubner — I. Institute of Physics (IA), RWTH Aachen University, Germany

As an alternative to metallic surface plasmon polaritons (SPPs), surface phonon polaritons (SPhPs) on polar dielectric crystals provide many opportunities in infrared and terahertz nanophotonic applications [1]. For example, localized SPhP modes have been experimentally demonstrated to show high quality factors on periodic nanopillar arrays (40-135) and single circular microcavities (around 60) [2][3]. However, such effects within SPhP structures can only be tunable by varying the size of nanostructure and resonances are fixed once fabricated. Here, we perform theoretical studies of active tuning of SPhPs by changing the phase of germanium antimony telluride (GST) thin film. Initial experiments are made with thermally and optically induced GST phase change [4][5].

[1] J. Caldwell et al., Nanophotonics (doi:10.1515/nanoph-2014-0003) (2014); [2] J. Caldwell et al., Nano Lett. 13, 3690-3697 (2013); [3] T. Wang et al., Nano Lett. 13, 5051-5055 (2013); [4] A. Michel et al., Nano Lett. 13, 3470-3475 (2013); [5] A. Michel et al., ACS Photonics 1 (9), 833-839 (2014).