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Updated: Feb 24, 2026

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
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Direct Wafer Bonding and Its Application to Waveguide Optical Isolators.

Tetsuya Mizumoto1, Yuya Shoji2, Ryohei Takei3

  • 1Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8552, Japan. tmizumot@pe.titech.ac.jp.

Materials (Basel, Switzerland)
|August 18, 2017
PubMed
Summary

Surface-activated direct bonding enables low-temperature joining of dissimilar materials like magneto-optic garnet with silicon and semiconductors. This technique is key for developing advanced waveguide optical isolators, improving device performance and size.

Keywords:
direct wafer bondingmagneto-opticsoptical isolatorwaveguide device

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Semiconductor Physics

Background:

  • Direct bonding is crucial for integrating diverse materials in advanced optical devices.
  • Challenges include thermal expansion mismatches and high-temperature processing requirements.
  • Surface activation offers a low-temperature alternative for dissimilar material integration.

Purpose of the Study:

  • To review the surface-activated direct bonding technique for waveguide optical isolator applications.
  • To highlight the advantages of low-temperature bonding for dissimilar materials.
  • To discuss the performance of different waveguide optical isolator designs.

Main Methods:

  • Review of surface-activated direct bonding principles and applications.
  • Integration of magneto-optic garnet with silicon, III-V semiconductors, and LiNbO₃.
  • Investigation of interferometric and semileaky waveguide optical isolator designs.

Main Results:

  • Successful low-temperature bonding of magneto-optic garnet to various substrates.
  • Demonstration of enhanced magneto-optic phase shift in silicon-on-insulator (SOI) waveguides.
  • Characterization of interferometric and semileaky waveguide optical isolators.

Conclusions:

  • Surface-activated direct bonding is a viable technique for fabricating waveguide optical isolators.
  • SOI waveguides offer advantages for compact isolator designs due to enhanced phase shifts.
  • Semileaky waveguide isolators provide fabrication tolerance and broad wavelength operation.