Patent ID: 8666208

Claim:
An optical waveguide comprising: a waveguide body having a top surface and an opposite bottom surface, a first side and an opposite second side; a plurality of in-coupling non-diffractive reflecting surfaces embedded in the waveguide body at the top surface, each being oriented to reflect light that enters the waveguide body through the bottom surface onto one or more internal paths inside the waveguide body and toward the second side; and a plurality of out-coupling non-diffractive reflecting surfaces embedded in the waveguide body at the top surface, each being oriented to reflect light incident from the one or more internal paths onto one or more exit paths that exit the waveguide body through the bottom surface, wherein the plurality of in-coupling non-diffractive reflecting surfaces comprises a sequence of parallel in-coupling grooves formed in the top surface and situated between the first side and the second side, each in-coupling groove having a non-diffractive reflecting surface, and wherein the plurality of out-coupling non-diffractive reflecting surfaces comprises a sequence of parallel out-coupling grooves formed in the top surface parallel to the sequence of in-coupling grooves and situated between the sequence of in-coupling grooves and the second side, each out-coupling groove having a non-diffractive reflecting surface.