公开(公告)号：US11994714B2

公开(公告)日：2024-05-28

申请号：US17490059

申请日：2021-09-30

Applicant: GLOBALFOUNDRIES U.S. Inc.

Inventor： Brett T. Cucci ,  Yusheng Bian ,  Abdelsalam Aboketaf ,  Edward W. Kiewra

IPC: G02B6/122 ,  G02B6/12 ,  G02B6/125 ,  G02B6/132

CPC classification number: G02B6/1228 ,  G02B6/1223 ,  G02B6/125 ,  G02B6/132 ,  G02B2006/12061 ,  G02B2006/12147 ,  G02B6/1225

Abstract: Disclosed are embodiments of a photonic integrated circuit (PIC) structure with a waveguide core having tapered sidewall liner(s) (e.g., symmetric tapered sidewall liners on opposing sides of a waveguide core, asymmetric tapered sidewall liners on opposing sides of a waveguide core, or a tapered sidewall liner on one side of a waveguide core). In some embodiments, the tapered sidewall liner(s) and waveguide core have different refractive indices. In an exemplary embodiment, the waveguide core is a first material (e.g., silicon) and the tapered sidewall liner(s) is/are a second material (e.g., silicon nitride) with a smaller refractive index than the first material. In another exemplary embodiment, the waveguide core is a first compound and the tapered sidewall liner(s) is/are a second compound with the same elements (e.g., silicon and nitrogen) as the first compound but with a smaller refractive index. Also disclosed are method embodiments for forming such a PIC structure.

公开(公告)号：US20230101580A1

公开(公告)日：2023-03-30

申请号：US17490059

申请日：2021-09-30

Applicant: GLOBALFOUNDRIES U.S. Inc.

Inventor： Brett T. Cucci ,  Yusheng Bian ,  Abdelsalam Aboketaf ,  Edward W. Kiewra

IPC: G02B6/122

Abstract: Disclosed are embodiments of a photonic integrated circuit (PIC) structure with a waveguide core having tapered sidewall liner(s) (e.g., symmetric tapered sidewall liners on opposing sides of a waveguide core, asymmetric tapered sidewall liners on opposing sides of a waveguide core, or a tapered sidewall liner on one side of a waveguide core). In some embodiments, the tapered sidewall liner(s) and waveguide core have different refractive indices. In an exemplary embodiment, the waveguide core is a first material (e.g., silicon) and the tapered sidewall liner(s) is/are a second material (e.g., silicon nitride) with a smaller refractive index than the first material. In another exemplary embodiment, the waveguide core is a first compound and the tapered sidewall liner(s) is/are a second compound with the same elements (e.g., silicon and nitrogen) as the first compound but with a smaller refractive index. Also disclosed are method embodiments for forming such a PIC structure.