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Permanent tuning of optical resonant modes of chalcogenide-coated microresonators

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Abstract

Chalcogenide materials are promising for optical resonant mode tuning of whispering gallery mode (WGM) microresonators due to their high nonlinearity. In this study, this phenomenon was demonstrated for ${{\rm Ge}_2}{{\rm Sb}_2}{{\rm Te}_5}$-coated toroidal microresonators using an optical postprocess, which utilizes the intrinsically photosensitive property of the ${{\rm Ge}_2}{{\rm Sb}_2}{{\rm Te}_5}$ coating. A signal laser was used to illuminate the resonator for permanent tuning of the WGMs in a sensitive manner. 0.01 nm and 0.02 nm permanent tuning of the WGMs was recorded for 5 nm and 10 nm coated resonators, respectively. This technique enables resonance matching of coupled optical resonators, which could pave the way for optoelectronic circuitries employing multiple optical microresonators.

© 2020 Optical Society of America

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