Coupling of a whispering gallery mode to a silicon chip with photonic crystal

Yuyang Zhuang, Hajime Kumazaki, Shun Fujii, Riku Imamura, Nurul Ashikin Binti Daud, Rammaru Ishida, Heming Chen, Takasumi Tanabe

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    We demonstrate the efficient coupling (99.5%) of a silica whispering gallery mode microresonator directly with a silicon chip by using a silicon photonic crystal waveguide as a coupler. The efficient coupling is attributed to the small effective refractive index difference between the two devices. The large group index of the photonic crystal waveguide mode also contributes to the efficient coupling. A coupling Q of 2.68 × 106 is obtained, which allows us to achieve the critical coupling of a silica whispering gallery mode with an intrinsic Q of close to 107 with a Si chip.

    Original languageEnglish
    Pages (from-to)5731-5734
    Number of pages4
    JournalOptics Letters
    Volume44
    Issue number23
    DOIs
    Publication statusPublished - 2019 Jan 1

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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  • Cite this

    Zhuang, Y., Kumazaki, H., Fujii, S., Imamura, R., Daud, N. A. B., Ishida, R., Chen, H., & Tanabe, T. (2019). Coupling of a whispering gallery mode to a silicon chip with photonic crystal. Optics Letters, 44(23), 5731-5734. https://doi.org/10.1364/OL.44.005731