Patent ID: 6403393
Filing Date: 2002-06-11
Classification: G02B

Abstract:
A method for making an optical structure waveguide in an electronic component comprising the steps of:forming a trench or other opening in a dielectric layer; depositing a first conformal layer of a dielectric material having a first index of refraction over the dielectric layer and into the bottom and sides of the trench; depositing a second core conformal layer of a dielectric material having a second index of refraction lower than the first index of refraction over the first conformal layer and into the bottom and sides of the trench; etching the second core conformal layer to a desired embedded vertical thickness in the trench in the form of a rectangle where the etch embedded layer is bounded on the bottom and sidewalls by the first conformal layer; depositing on the etched surface a third conformal layer of a dielectric material having a third index of refraction higher than the second index of refraction; planarizing the dielectric layer until the first and third conformal layers are planar at the surface of the dielectric with the second core conformal layer in the trench being surrounded at the bottom and side faces thereof by the first conformal layer and on the top by the third conformal layer.