Abstract: The present disclosure generally provides waveguide combiners and methods thereof. The waveguide combiners include a substrate. A first grating is disposed over the substrate. The first grating includes a first device structure. A first coating layer is disposed over the first device structure. A first donor substrate is disposed over the first coating layer. A second grating is disposed over the substrate. The second grating includes a second device structure. A second coating layer is disposed over the second device structure. A second donor substrate is disposed over the second coating layer. An encapsulation layer is disposed over the first grating and the second grating.

Abstract: The present disclosure generally provides waveguide combiners and methods thereof. The methods include forming a waveguide combiner by disposing a first grating including a first device structure over a first donor substrate. The first grating is transferred from the first donor substrate to a waveguide substrate.

Abstract: Optical device films and methods of forming optical device films having a RMS surface roughness less than about 2.2 ?in and a refractive index greater than 2.0 are provided. In one embodiment, an optical device film is provided and includes a crystalline or nano-crystalline material having a refractive index greater than 2.0. A top surface of the optical device film has a root-mean-square (RMS) surface roughness less than about 2.2 microinches (?in).