Influence of the lattice mismatch strain on the surface morphology of ZnMgTe/ZnTe/ZnMgTe electro-optical waveguide structure

Fukino Kazami, Wei Che Sun, Kosuke Taguri, Taizo Nakasu, Takayuki Aiba, Sotaro Yamashita, Shota Hattori, Takeru Kizu, Masakazu Kobayashi, Toshiaki Asahi

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    ZnMgTe/ZnTe waveguide is a high potential electro-optical device. Thick and high Mg composition cladding layers are required for high optical performance waveguides. However, adding Mg would increase the lattice mismatch between ZnMgTe and ZnTe which would cause dislocation defects and generate asperities at interfaces. In this article, influence of the lattice mismatch strain to the waveguide surface morphology was studied. Waveguide structures were prepared by molecular beam epitaxy. The surface morphologies were observed using atomic force microscope and propagation loss of the waveguides were studied. Total of 0.5-0.7μm asperities were observed on the surface of waveguides with 20% of Mg composition and 1.2μm of the total cladding layer thickness. The asperities on the surface became larger (1.0-1.2μm) when the Mg composition increased to 40%. The propagation loss of the waveguide was suppressed to 7dB by tuning the growth parameters and the resulting interface roughness.

    Original languageEnglish
    Pages (from-to)635-639
    Number of pages5
    JournalPhysica Status Solidi (B) Basic Research
    Volume253
    Issue number4
    DOIs
    Publication statusPublished - 2016 Apr 1

    Fingerprint

    Lattice mismatch
    Optical waveguides
    optical waveguides
    Surface morphology
    Waveguides
    waveguides
    Electrooptical devices
    Chemical analysis
    propagation
    Molecular beam epitaxy
    Microscopes
    molecular beam epitaxy
    roughness
    Tuning
    Surface roughness
    tuning
    microscopes
    Defects
    causes
    defects

    Keywords

    • Molecular beam epitaxy
    • Surface morphology
    • Waveguides
    • ZnMgTe
    • ZnTe

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Influence of the lattice mismatch strain on the surface morphology of ZnMgTe/ZnTe/ZnMgTe electro-optical waveguide structure. / Kazami, Fukino; Sun, Wei Che; Taguri, Kosuke; Nakasu, Taizo; Aiba, Takayuki; Yamashita, Sotaro; Hattori, Shota; Kizu, Takeru; Kobayashi, Masakazu; Asahi, Toshiaki.

    In: Physica Status Solidi (B) Basic Research, Vol. 253, No. 4, 01.04.2016, p. 635-639.

    Research output: Contribution to journalArticle

    Kazami, Fukino ; Sun, Wei Che ; Taguri, Kosuke ; Nakasu, Taizo ; Aiba, Takayuki ; Yamashita, Sotaro ; Hattori, Shota ; Kizu, Takeru ; Kobayashi, Masakazu ; Asahi, Toshiaki. / Influence of the lattice mismatch strain on the surface morphology of ZnMgTe/ZnTe/ZnMgTe electro-optical waveguide structure. In: Physica Status Solidi (B) Basic Research. 2016 ; Vol. 253, No. 4. pp. 635-639.
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    AU - Sun, Wei Che

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    AU - Nakasu, Taizo

    AU - Aiba, Takayuki

    AU - Yamashita, Sotaro

    AU - Hattori, Shota

    AU - Kizu, Takeru

    AU - Kobayashi, Masakazu

    AU - Asahi, Toshiaki

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