Universal light-guiding geometry for on-chip resonators having extremely high Q-factor

Dae Gon Kim, Sangyoon Han, Joonhyuk Hwang, In Hwan Do, Dongin Jeong, Ji Hun Lim, Yong Hoon Lee, Muhan Choi, Yong Hee Lee, Duk Yong Choi*, Hansuek Lee*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    53 Citations (Scopus)

    Abstract

    By providing an effective way to leverage nonlinear phenomena in integrated devices, high-Q optical resonators have led to recent advances in on-chip photonics. However, developing fabrication processes to shape any new material into a resonator with extremely smooth surfaces on a chip has been an exceptionally challenging task. Here, we describe a universal method to implement ultra-high-Q resonators with any new material having desirable properties that can be deposited by physical vapor deposition. Using this method light-guiding cores with surface roughness on the molecular-scale are created automatically on pre-patterned substrates. Its efficacy has been verified using As2S3, a chalcogenide glass that has high-nonlinearity. The Q-factor of the As2S3 resonator so-developed approached the propagation loss record achieved in chalcogenide fibers which were limited by material losses. Owing to the boosted Q-factor, lasing by stimulated Brillouin scattering has been demonstrated with 100 times lower threshold power than the previous record.

    Original languageEnglish
    Article number5933
    JournalNature Communications
    Volume11
    Issue number1
    DOIs
    Publication statusPublished - Dec 2020

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