Polymer Waveguide Couplers for Fluorite Microresonators
2017
We report on the development of a planar evanescent-field coupler for calcium fluoride (CaF 2 ) whispering gallery mode resonators using polymer rib waveguides and demonstrate 80% coupling efficiency with resonators characterized with the loaded quality factors exceeding 10 8 . The coupling efficiency is limited due to emission of light from the resonator mode to the unconfined modes of the waveguide.
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