Patent ID: 7801406
Filing Date: 2010-09-21
Classification: B82Y,G02B

Abstract:
1. A method of forming a low loss crystal quality waveguide comprising: providing a substrate; forming a dielectric layer on the substrate; forming a channel by etching a portion of said dielectric layer, said channel comprises the shape of a ring or micro-ring; smoothing the sidewalls of the channel so as to have a root mean square roughness of less than 2 nm; selectively growing a continuous and uniform strip of single crystal SiGe, Ge or Si continuously and uniformly within the channel so as to completely fill the channel; planarizing the top surface of the continuous and uniform strip of single crystal by chemical mechanical polishing; forming an uppercladding over said single crystal that comprises materials having an index lower than SiGe; and thermally annealing said above mentioned layers at a defined temperature range.