Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 9: Poster Session
DF 9.9: Poster
Dienstag, 21. März 2017, 14:00–16:00, P1C
Properties of metal-coated polymeric whispering gallery mode resonators — •Patrick Forster1, Carolin Klusmann1, Jens Oppermann2, Carsten Rockstuhl2, 3, and Heinz Kalt1 — 1Institute of Applied Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 2Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 3Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
Whispering-gallery mode resonators are characterized by high Q-factors and a small mode volume V. This renders them promising candidates for devices in biological sensing applications or in non-linear optics. A unique quantity, the figure-of-merit defined as Q/V, is usually used to judge the suitability of a given structure for these applications. Here, we study whether the figure-of-merit can be notably improved by coating the resonator with a noble metal such as silver or gold. At the interface between the dielectric medium of the cavity and the metal coating, surface plasmon polaritons (SPP) can be sustained. They possess a high field confinement and show large field enhancements at the interface. In addition, hybrid modes occur due to the coupling of plasmonic and dielectric modes. Hybrid modes fuse the advantage of both modes and show, therefore, strong field localization while preserving fairly high Q-factors. In this study that combines theory and experiment, we investigate the influence of different cavity geometries and characteristic parameters of the resonator to obtain a fundamental understanding of the hybrid system operated at near-infrared frequencies.