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Opt Express. 2012 Sep 24;20(20):22012-7. doi: 10.1364/OE.20.022012.

Flexible coupling of high-Q goblet resonators for formation of tunable photonic molecules.

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Institute of Applied Physics and DFG Center for Functional Nanostructures CFN, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany.


We report on a method for a highly flexible arrangement of polymeric high-Q whispering gallery mode resonators. Parallel on-chip fabricated goblet resonators are detached from the substrate by bonding a gold wire to the field-free center of their polymeric cavity. This enables the precise control of the resonator's spatial position. The modal spectrum of the detached resonator reveals preservation of its high optical quality. Manipulation of the resonators' position allows for designing coupled resonators geometries and tuning the coupling properties dynamically after batch fabrication. The properties of the modal spectrum evidence the successful optical coupling.

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