Patent ID: 6387720
Filing Date: 2002-05-14
Classification: G02B

Abstract:
A method for making a waveguide structure implementing CMOS fabrication processes, the method comprising:providing a substrate having a plurality of active devices fabricated therein and an overlying oxide layer; defining a contact hole through the oxide layer to define a path down to the substrate; depositing a first metallization coating over the oxide layer and in the contact hole; removing the first metallization coating at a base of the contact hole to define the path down to the substrate; filling the contact hole with a contact hole dielectric material; forming a waveguide dielectric over the first metallization coating and in contact with the contact hole dielectric material; forming a second metallization coating over the waveguide dielectric; patterning the second metallization coating, the waveguide dielectric, and the first metallization coating, the patterning being configured to leave a partial waveguide structure that has the contact hole dielectric material in contact with the waveguide dielectric; and forming a third metallization coating over the partial waveguide structure, the third metallization being configured to define metallization spacers that connect the first metallization coating and the second metallization coating and to enclose the waveguide dielectric and define the waveguide structure.