Patent ID: 9111730
Filing Date: 2015-08-18
Classification: B82Y,C23C,G02B,G02F,H01J

Abstract:
1. A method for producing a high-refractive index contrast and low loss optical waveguide, the method comprising the steps of: depositing a lower cladding material layer with a first low refractive index on a silicon base substrate; depositing or growing a refractory metal layer on top of the lower cladding material layer with the first low refractive index; forming an etch mask layer deposited on the refractory metal layer; selectively etching the refractory metal layer utilizing a dry-etching tool with high selectivity to the etch mask layer; oxidizing the refractory metal layer in high-temperature ambient oxygen, wherein the refractory metal layer subsequently forms an oxidized refractory metal region; and depositing a top cladding layer made of a second low refractive index material to encapsulate the oxidized refractory metal region on top of the lower cladding material layer.