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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Postersession KFM

KFM 14.3: Poster

Mittwoch, 3. April 2019, 16:00–18:30, Poster C

Wide Tunability of Coupled WGM Resonators Using Flexible Elastomer Substrates — •Simon Woska, Lukas Mall, Jannis Hessenauer, Carolin Klusmann, Tobias Siegle, and Heinz Kalt — Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany

Whispering-Gallery-Mode (WGM) resonators are promising building blocks in photonic devices like optical filters or Coupled Resonator Optical Waveguides (CROWs). Contrary to common implementations of WGM resonators using silica as resonator material, we focus on polymers, which allow for a low-cost and upscalable production.

For plenty of photonic applications a tunable inter-cavity gap between different resonators is highly demanded. These properties can be achieved using flexible substrates, such as elastomers.

Flexible tuning of the inter-cavity gap has been successfully realized in our research group using a mechanically deformable elastomer as substrate. In this contribution, we propose a system based on substrates made from Liquid Crystal Elastomers (LCEs). Due to a phase transition at rather low temperatures, LCE undergoes a fully reversible change in dimension when heated. Thanks to this feature, LCE substrates exhibit several advantages compared to mechanically deformable substrates, including a more adjustable actuation.

We demonstrate the advantages of LCEs over the established mechanically deformable substrates and propose different approaches for the realization of such a tunable system. First results of coupled high-Q WGM resonators structured on LCE substrates are presented.