Propagation loss reduction of ZnMgTe/ZnTe waveguide devices

Wei Che Sun, Fukino Kazami, Jing Wang, Taizo Nakasu, Shota Hattori, Takeru Kizu, Yuki Hashimoto, Masakazu Kobayashi, Toshiaki Asahi

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    A ZnMgTe/ZnTe electro-optic (EO) waveguide has great potential to be utilized for practical applications. A low-dislocation ZnMgTe/ZnTe waveguide can be fabricated when the cladding layer thickness is below 20-fold the calculated critical layer thickness (CCLT × 20). To improve optical confinement, a waveguide with a thicker cladding layer or a higher Mg% should be considered. However, the device performance might be affected because of crystal quality deterioration since the lattice mismatch between MgTe and ZnTe was around 4.1%. In this study, optical confinement and propagation loss were examined by changing the dimensions of the ZnMgTe/ZnTe waveguide structure. The propagation loss, EO characteristics, and crystal quality of the fabricated waveguides were mainly studied. A waveguide with a cladding layer thickness of around 1.5-fold the 1/e penetration depth of the evanescent wave (dp1/e × 1.5, corresponding to CCLT × 100) showed better optical properties than other waveguides, although its interface defect density was reasonably high.

    Original languageEnglish
    Article number082201
    JournalJapanese Journal of Applied Physics
    Volume55
    Issue number8
    DOIs
    Publication statusPublished - 2016 Aug 1

    ASJC Scopus subject areas

    • Engineering(all)
    • Physics and Astronomy(all)

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  • Cite this

    Sun, W. C., Kazami, F., Wang, J., Nakasu, T., Hattori, S., Kizu, T., Hashimoto, Y., Kobayashi, M., & Asahi, T. (2016). Propagation loss reduction of ZnMgTe/ZnTe waveguide devices. Japanese Journal of Applied Physics, 55(8), [082201]. https://doi.org/10.7567/JJAP.55.082201