All-optical tunable buffering with coupled ultra-high Q whispering gallery mode microcavities

Wataru Yoshiki, Yoshihiro Honda, Tomohiro Tetsumoto, Kentaro Furusawa, Norihiko Sekine, Takasumi Tanabe

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    All-optical tunable buffering was recently achieved on a chip by using dynamically tuned coupled mode induced transparency, which is an optical analogue of electromagnetically induced transparency. However, the small Q s of about 105 used in those systems were limiting the maximum buffering time to a few hundred ps. Although employing an ultra-high Q whispering gallery mode (WGM) microcavity can significantly improve the maximum buffering time, the dynamic tuning of the WGM has remained challenging because thermo-optic and pressure tunings, which are widely used for WGM microcavities, have a very slow response. Here we demonstrate all-optical tunable buffering utilizing coupled ultra-high Q WGM cavities and the Kerr effect. The Kerr effect can change the refractive index instantaneously, and this allowed us to tune the WGM cavity very quickly. In addition, from among the various WGM cavities we employed a silica toroid microcavity for our experiments because it has an ultra-high Q factor (>2 × 107) and a small mode volume, and can be fabricated on a chip. Use of the Kerr effect and the silica toroid microcavity enabled us to observe an on-chip all-optical tunable buffering operation and achieve a maximum buffering time of 20 ns.

    Original languageEnglish
    Article number10688
    JournalScientific Reports
    Volume7
    Issue number1
    DOIs
    Publication statusPublished - 2017 Dec 1

    ASJC Scopus subject areas

    • General

    Fingerprint Dive into the research topics of 'All-optical tunable buffering with coupled ultra-high Q whispering gallery mode microcavities'. Together they form a unique fingerprint.

  • Cite this