Extremely efficient coupling of silica toroid microresonator to silicon chip with photonic crystal waveguide

Yuyang Zhuang, Hajime Kumazaki, Shun Fujii, Takasumi Tanabe

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Compact and low-loss coupling to whispering gallery mode (WGM) microresonators is important for a wide range of applications from fundamental physics to sensing and lasing, including a microresonator frequency comb. High-Q microresonators have been fabricated with silica and crystalline WGMs but highly efficient, robust, and compact coupling remained a challenge [1]. Although coupling to a silicon (Si) chip will allow a variety of applications, the major challenge is the large refractive index mismatch between high-Q microresonators (e.g., silica; nsilica = 1.44) and the commonly used photonic platforms (e.g., Si; nSi = 3.48) [2]. The large refractive index difference leads to a large phase mismatch. Here we found and demonstrated experimentally that extremely efficient coupling between a WGM and a Si chip is possible by using a 2D photonic crystal (PhC) waveguide (WG).

    Original languageEnglish
    Title of host publicationThe European Conference on Lasers and Electro-Optics, CLEO_Europe_2019
    PublisherOSA - The Optical Society
    ISBN (Electronic)9781557528209
    Publication statusPublished - 2019 Jan 1
    EventThe European Conference on Lasers and Electro-Optics, CLEO_Europe_2019 - Munich, Germany
    Duration: 2019 Jun 232019 Jun 27

    Publication series

    NameOptics InfoBase Conference Papers
    VolumePart F140-CLEO_Europe 2019

    Conference

    ConferenceThe European Conference on Lasers and Electro-Optics, CLEO_Europe_2019
    CountryGermany
    CityMunich
    Period19/6/2319/6/27

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Mechanics of Materials

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  • Cite this

    Zhuang, Y., Kumazaki, H., Fujii, S., & Tanabe, T. (2019). Extremely efficient coupling of silica toroid microresonator to silicon chip with photonic crystal waveguide. In The European Conference on Lasers and Electro-Optics, CLEO_Europe_2019 [2019-ck_5_2] (Optics InfoBase Conference Papers; Vol. Part F140-CLEO_Europe 2019). OSA - The Optical Society.