Efficient light coupling into a photonic crystal waveguide with flatband slow mode

A. Säynätjoki (Corresponding Author), K. Vynck, M. Mulot, D. Cassagne, Jouni Ahopelto, H. Lipsanen

    Research output: Contribution to journalArticleScientificpeer-review

    9 Citations (Scopus)

    Abstract

    We design an efficient coupler to transmit light from a strip waveguide into the flatband slow mode of a photonic crystal waveguide with ring-shaped holes. The coupler is a section of a photonic crystal waveguide with a higher group velocity, obtained by different ring dimensions. We demonstrate coupling efficiency in excess of 95% over the 8 nm wavelength range where the photonic crystal waveguide exhibits a quasi-constant group velocity vgc/37 and observe a more than 12-fold intensity enhancement in the slow-light waveguide. An analysis based on the small Fabry–Pérot resonances in the simulated transmission spectra is used for studying the effect of the coupler length and for evaluating the coupling efficiency in different parts of the coupler. The mode conversion efficiency within the coupler is more than 99.7% over the wavelength range of interest. The parasitic reflectance in the coupler, which depends on the propagation constant mismatch between the slow mode and the coupler mode, is lower than 0.6%.
    Original languageEnglish
    Pages (from-to)127 - 133
    Number of pages7
    JournalPhotonics and Nanostructures: Fundamentals and Applications
    Volume6
    Issue number2
    DOIs
    Publication statusPublished - 2008
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Photonic crystals
    couplers
    Waveguides
    photonics
    waveguides
    crystals
    Slow light
    Wavelength
    group velocity
    Optical waveguides
    Conversion efficiency
    rings
    wavelengths
    strip
    reflectance
    propagation
    augmentation

    Keywords

    • Guided waves
    • Integrated optics materials
    • Optical systems design
    • Waveguide
    • Photonic integrated circuits
    • Dispersion
    • Photonic crystal

    Cite this

    Säynätjoki, A. ; Vynck, K. ; Mulot, M. ; Cassagne, D. ; Ahopelto, Jouni ; Lipsanen, H. / Efficient light coupling into a photonic crystal waveguide with flatband slow mode. In: Photonics and Nanostructures: Fundamentals and Applications. 2008 ; Vol. 6, No. 2. pp. 127 - 133.
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    title = "Efficient light coupling into a photonic crystal waveguide with flatband slow mode",
    abstract = "We design an efficient coupler to transmit light from a strip waveguide into the flatband slow mode of a photonic crystal waveguide with ring-shaped holes. The coupler is a section of a photonic crystal waveguide with a higher group velocity, obtained by different ring dimensions. We demonstrate coupling efficiency in excess of 95{\%} over the 8 nm wavelength range where the photonic crystal waveguide exhibits a quasi-constant group velocity vg ≈ c/37 and observe a more than 12-fold intensity enhancement in the slow-light waveguide. An analysis based on the small Fabry–P{\'e}rot resonances in the simulated transmission spectra is used for studying the effect of the coupler length and for evaluating the coupling efficiency in different parts of the coupler. The mode conversion efficiency within the coupler is more than 99.7{\%} over the wavelength range of interest. The parasitic reflectance in the coupler, which depends on the propagation constant mismatch between the slow mode and the coupler mode, is lower than 0.6{\%}.",
    keywords = "Guided waves, Integrated optics materials, Optical systems design, Waveguide, Photonic integrated circuits, Dispersion, Photonic crystal",
    author = "A. S{\"a}yn{\"a}tjoki and K. Vynck and M. Mulot and D. Cassagne and Jouni Ahopelto and H. Lipsanen",
    year = "2008",
    doi = "10.1016/j.photonics.2008.03.001",
    language = "English",
    volume = "6",
    pages = "127 -- 133",
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    Efficient light coupling into a photonic crystal waveguide with flatband slow mode. / Säynätjoki, A. (Corresponding Author); Vynck, K.; Mulot, M.; Cassagne, D.; Ahopelto, Jouni; Lipsanen, H.

    In: Photonics and Nanostructures: Fundamentals and Applications, Vol. 6, No. 2, 2008, p. 127 - 133.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Efficient light coupling into a photonic crystal waveguide with flatband slow mode

    AU - Säynätjoki, A.

    AU - Vynck, K.

    AU - Mulot, M.

    AU - Cassagne, D.

    AU - Ahopelto, Jouni

    AU - Lipsanen, H.

    PY - 2008

    Y1 - 2008

    N2 - We design an efficient coupler to transmit light from a strip waveguide into the flatband slow mode of a photonic crystal waveguide with ring-shaped holes. The coupler is a section of a photonic crystal waveguide with a higher group velocity, obtained by different ring dimensions. We demonstrate coupling efficiency in excess of 95% over the 8 nm wavelength range where the photonic crystal waveguide exhibits a quasi-constant group velocity vg ≈ c/37 and observe a more than 12-fold intensity enhancement in the slow-light waveguide. An analysis based on the small Fabry–Pérot resonances in the simulated transmission spectra is used for studying the effect of the coupler length and for evaluating the coupling efficiency in different parts of the coupler. The mode conversion efficiency within the coupler is more than 99.7% over the wavelength range of interest. The parasitic reflectance in the coupler, which depends on the propagation constant mismatch between the slow mode and the coupler mode, is lower than 0.6%.

    AB - We design an efficient coupler to transmit light from a strip waveguide into the flatband slow mode of a photonic crystal waveguide with ring-shaped holes. The coupler is a section of a photonic crystal waveguide with a higher group velocity, obtained by different ring dimensions. We demonstrate coupling efficiency in excess of 95% over the 8 nm wavelength range where the photonic crystal waveguide exhibits a quasi-constant group velocity vg ≈ c/37 and observe a more than 12-fold intensity enhancement in the slow-light waveguide. An analysis based on the small Fabry–Pérot resonances in the simulated transmission spectra is used for studying the effect of the coupler length and for evaluating the coupling efficiency in different parts of the coupler. The mode conversion efficiency within the coupler is more than 99.7% over the wavelength range of interest. The parasitic reflectance in the coupler, which depends on the propagation constant mismatch between the slow mode and the coupler mode, is lower than 0.6%.

    KW - Guided waves

    KW - Integrated optics materials

    KW - Optical systems design

    KW - Waveguide

    KW - Photonic integrated circuits

    KW - Dispersion

    KW - Photonic crystal

    U2 - 10.1016/j.photonics.2008.03.001

    DO - 10.1016/j.photonics.2008.03.001

    M3 - Article

    VL - 6

    SP - 127

    EP - 133

    JO - Photonics and Nanostructures: Fundamentals and Applications

    JF - Photonics and Nanostructures: Fundamentals and Applications

    SN - 1569-4410

    IS - 2

    ER -