Patent ID: 9048378
Filing Date: 2015-06-02
Classification: B82Y,H01L,H01S

Abstract:
1. A device comprising: a first at least partially transparent layer having a first profiled surface, wherein the first profiled surface comprises a set of large roughness components providing a first variation of the first profiled surface having a first characteristic scale; a second at least partially transparent layer having a second profiled surface adjacent to the first profiled surface, wherein the second profiled surface comprises a set of small roughness components providing a second variation of the second profiled surface having a second characteristic scale, and wherein the first characteristic scale is approximately an order of magnitude larger than the second characteristic scale, wherein the first at least partially transparent layer and the second at least partially transparent layer are sapphire; and bonding material attaching the first profiled surface and the second profiled surface, wherein the bonding material has a refractive index selected based on a refractive index of at least one of: a material of the first at least partially transparent layer or a material of the second at least partially transparent layer.