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 publication2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    ISBN (Electronic)9781728104690
    DOIs
    Publication statusPublished - 2019 Jun
    Event2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019 - Munich, Germany
    Duration: 2019 Jun 232019 Jun 27

    Publication series

    Name2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019

    Conference

    Conference2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
    Country/TerritoryGermany
    CityMunich
    Period19/6/2319/6/27

    ASJC Scopus subject areas

    • Spectroscopy
    • Electronic, Optical and Magnetic Materials
    • Instrumentation
    • Atomic and Molecular Physics, and Optics
    • Computer Networks and Communications

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