Coupled cavities and band-edge slow-light effects in periodic waveguides

Andrey A. Sukhorukov, Sangwoo Ha, Andrei V. Lavrinenko, Yuri S. Kivshar

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    1 Citation (Scopus)

    Abstract

    We demonstrate, theoretically and experimentally, that the modes of coupled cavities created in periodic waveguides can depend critically on the lateral shift between the cavities. In the absence of such shift, the modes feature symmetric or antisymmetric profiles, and their frequency splitting generally increases as the cavities are brought closer. We show that the longitudinal shift enables flexible control over the fundamental modes, which frequency detuning can be reduced down to zero. Our coupled-mode theory analysis reveals an intrinsic link between the mode tuning and the transformation of slow-light dispersion at the photonic band-edge. We illustrate our approach through direct numerical modelling of cavities created in arrays of dielectric rods, nanobeam structures, and two-dimensional photonic-crystal waveguides. We also present experimental results for coupled rod cavities confirming our predictions.

    Original languageEnglish
    Title of host publicationAdvances in Slow and Fast Light III
    DOIs
    Publication statusPublished - 2010
    EventAdvances in Slow and Fast Light III - San Francisco, CA, United States
    Duration: 25 Jan 201026 Jan 2010

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    Volume7612
    ISSN (Print)0277-786X

    Conference

    ConferenceAdvances in Slow and Fast Light III
    Country/TerritoryUnited States
    CitySan Francisco, CA
    Period25/01/1026/01/10

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