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O: Fachverband Oberflächenphysik

O 71: Plasmonics and Nanooptics III

O 71.2: Vortrag

Donnerstag, 3. April 2014, 10:45–11:00, GER 38

Tuning propagating surface phonon polaritons at mid-infrared frequencies using a phase-change material — •Tao Wang, Peining Li, Ann-Katrin Michel, Dmitry N. Chigrin, Matthias Wuttig, and Thomas Taubner — 1st Institute of Physics (IA), RWTH Aachen University, 52056, Aachen, Germany

Plasmonic antennas are crucial components for nano-optics and have been extensively used to enhance sensing, spectroscopy, light emission, photodetection and others [1, 2]. Nowadays, there is a trend to search for new plasmonic materials with low intrinsic loss at new plasmon frequencies. Alternative to metals, polar crystals have a negative real part of permittivity in the Reststrahlen band and support surface phonon polaritons (SPhP) with weak damping. Recently, we experimentally demonstrated single circular microcavities with well-defined, size-tunable SPhP resonances possessing high Q factors around 60 which are much higher than those in surface plasmon polariton resonators with similar structures [3]. In this work, we present that the dispersion of propagating surface phonon polaritons and the resonances of circular SPhP microcavities can be tuned by the phase change of a thin-layer germanium antimony telluride (GST). The tunability of the propagating SPhP dispersion and resonance pave the way for realizing single active antennas with high Q-factors at mid-infrared frequencies.

[1] L. Novotny et al., Nat. Photonics 5, 83-90 (2011). [2] P. Biagioni,et al., Rep. Prog. Phys. 75, 024402 (2012). [3] T. Wang et al., Nano Lett. 13, 5051-5055 (2013).