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DF: Fachverband Dielektrische Festkörper
DF 13: Nano- and microstructured dielectrics/thin films (DF with KR)
DF 13.5: Talk
Thursday, March 10, 2016, 10:50–11:10, H26
Flexible formation of coupled active polymeric whispering gallery mode cavities on an elastomer substrate — •Stefan Schierle1, Tobias Siegle1, Sarah Krämmer1, Benjamin Richter2, Sentayehu Wondimu3, Peter Schuch3, Christian Koos4, and Heinz Kalt1 — 1Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — 2Zoological Institute, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — 3Institute of Microstructure Technology, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — 4Institute of Photonics and Quantum Electronics, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
Optical modes in whispering gallery resonators are classified in analogy to electronic orbitals in atoms. Coupling between multiple resonators allows a photon exchange among them and leads to the formation of so-called photonic molecules.
Dye (pyrromethene 597)-doped active micro disk and goblet cavities are structured in a linear configuration by direct laser writing on a flexible elastomer substrate. Stretching the substrate and using its lateral contraction allows a fine tuning of the inter-cavity gaps. This enables the formation of photonic molecules consisting of two and three micro cavities. Spatially resolved spectroscopy demonstrated both the localization of super-modes, e.g. modes being resonant in the coupled system, and also the extinction of non-resonant modes in the photonic molecules. Relaxation of the substrate shows a change back to the uncoupled modal spectrum.