Berlin 2018 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 5: Whispering Gallery Mode Resonators II
KFM 5.2: Talk
Monday, March 12, 2018, 15:30–15:50, EMH 025
Hybrid photonic-plasmonic whispering-gallery-mode resonators — •Carolin Klusmann1, Jens Oppermann2, Patrick Forster1, Carsten Rockstuhl2, and Heinz Kalt1 — 1Insitute of Applied Physics, KIT, Karlsruhe, Germany — 2Institute of Theoretical Solid State Physics, KIT, Karlsruhe, Germany
Hybrid photonic-plasmonic systems combining high-Q dielectric whispering-gallery-mode (WGM) resonators with plasmonic elements are a promising platform to study cQED-phenomena or nonlinear effects. In this contribution, we investigate the modal characteristics of a wedge-like polymeric WGM resonator coated with a thin silver layer which is evanescently coupled to a tapered fiber. The hybrid system is carefully engineered to support three distinct categories of eigenmodes: photonic modes, surface-plasmon-polariton modes, localized at the metal-dielectric interface, as well as hybrid modes. Owing to similar Q-values for both photonic and hybrid modes, and owing to the high sensitivity of the resonance wavelengths to tiny variations in the resonator geometry and permittivity, an assignment of the experimentally observed resonances with the simulated eigenmodes is challenging. Hence, an experimental ansatz is required to identify the measured resonances. FEM simulations considering the interaction with the input waveguide suggest, that measuring the coupling strength of the eigenmodes as a function of the relative horizontal distance between fiber and resonator edge in combination with a polarization dependent excitation allows for an unambiguous classification of the modes. We verify this experimentally.