Patent ID: 6993236

Claim:
A light scattering element for an optical waveguide with a core, where the core of the optical waveguide is comprised of: a slab of monocrystalline silicon, a first layer of dielectric material disposed on the slab of monocrystalline silicon, and a strip of monocrystalline silicon disposed on the first layer of dielectric material, where the strip and a silicon body of a transistor are formed from the same monocrystalline silicon on the same substrate, and the light scattering element is comprised of: a second layer of dielectric material disposed on the strip of monocrystalline silicon, where the second layer of dielectric material and a gate oxide for a transistor are formed at the same time of the same dielectric material, a layer of polysilicon disposed on the second layer of dielectric material, where the layer of polysilicon and a polysilicon gate for a transistor are formed at the same time from the same polysilicon, and a cladding comprised of a plurality of dielectric materials, where the cladding is disposed over: the core of the waveguide, the second layer of dielectric materials and the layer of polysilicon, and at least one of the plurality of dielectric materials is comprised of a layer of salicide block used during the fabrication of a transistor.