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 journalArticlepeer-review

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
Externally publishedYes

ASJC Scopus subject areas

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

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