Fabrication of a bonded LNOI waveguide structure on Si substrate using ultra-precision cutting

Ryo Takigawa, Keigo Kamimura, Kenta Asami, Keiichi Nakamoto, Toru Tomimatsu, Tanemasa Asano

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The heterogeneous integration of an LNOI waveguide device on a mature Si platform is interesting for the creation of a future high density and multi-functional platform. This paper reports the fabrication of a bent LNOI waveguide on Si substrate using surface activated bonding with a Si nanoadhesive layer and post-bond ultra-precision cutting at room temperature. This bonding method demonstrates the sufficient bond strength between an LN wafer and thermally grown SiO2 to withstand ductile-mode cutting for waveguide fabrication. In this work, the width, height, and bent radius of the ridged LNOI waveguide on Si substrate were approximately 5, 2.5, and 300 μm, respectively. These room-temperature bonding and cutting methods are expected to fabricate various heterogenous devices with a large coefficient of thermal expansion mismatch between dissimilar materials, not just LNOI/Si waveguide devices.

Original languageEnglish
Article numberSBBD03
JournalJapanese journal of applied physics
Issue numberSB
Publication statusPublished - Feb 1 2020

All Science Journal Classification (ASJC) codes

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


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