公开(公告)号：WO2020254799A1

公开(公告)日：2020-12-24

申请号：PCT/GB2020/051459

申请日：2020-06-17

Applicant: UNIVERSITY OF SOUTHAMPTON

Inventor： CARPENTER, Lewis Glynn ,  BERRY, Sam Adam ,  GAWITH, Corin Barry Edmund ,  SMITH, Peter George Robin

IPC: G02F1/355 ,  G02F1/377

Abstract: A method for fabricating an optical waveguide comprises: providing a sample of lithium niobate doped with magnesium oxide and having at least one grating of periodic domain inversion defined therein; applying a layer of metallic zinc to a surface of the sample over the at least one grating using sputter deposition; heating the sample in an atmosphere of pure oxygen to cause the zinc to indiffuse into the lithium niobate to form a waveguiding layer of increased refractive index under the surface of the sample; and using a dicing blade to cut two substantially parallel channels along a length direction of the at least one grating, to define a ridge waveguide between the two channels.