Fiber-coupled photonic crystal nanocavity for reconfigurable formation of coupled cavity system

Tomohiro Tetsumoto, Yuta Ooka, Takasumi Tanabe

    研究成果: Conference contribution

    抄録

    High Q optical cavities are employed to realize a coupled cavity system with which to achieve optical signal processing. Photonic crystal (PhC) nanocavities are particularly attractive because they are suitable for integration. However, they usually suffer from low coupling efficiency with optical fiber and poor resonant wavelength controllability. We recently demonstrated cavity mode formation by placing a tapered nanofiber close to a two-dimensional photonic crystal waveguide. The cavity mode couples directly with the nanofiber, which results in a coupling efficiency of 39% with a high Q of over half a million. The cavity is formed due to the modulation of the effective refractive index, which is caused by bringing a nanofiber close to the silicon slab. Precise tuning of the resonant wavelength becomes possible by changing the contact area of the nanofiber. In this study, we demonstrate the coupling and de-coupling of coupled PhC nanocavities formed by a nanofiber placed on a PhC waveguide. The wavelength shift of one of the cavities (mode A) is more sensitive than that of the other cavity (mode B) to a change in the nanofiber contact area. By using this difference, we can tune the resonant wavelength of mode A (Q = 4.6×105) to that of mode B (Q = 6.0×105). Then, a clear anti-crossing with a mode splitting of g/2π = 0.94 GHz is observed, which is the result of the coupling of the two modes. A reconfigurable coupled cavity system was demonstrated.

    本文言語English
    ホスト出版物のタイトルPhotonic and Phononic Properties of Engineered Nanostructures VI
    出版社SPIE
    9756
    ISBN(電子版)9781628419917
    DOI
    出版ステータスPublished - 2016
    イベントPhotonic and Phononic Properties of Engineered Nanostructures VI - San Francisco, United States
    継続期間: 2016 2 152016 2 18

    Other

    OtherPhotonic and Phononic Properties of Engineered Nanostructures VI
    CountryUnited States
    CitySan Francisco
    Period16/2/1516/2/18

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Electrical and Electronic Engineering
    • Applied Mathematics

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