A method for manufacturing a diffractive optical element for total internal reflection, comprising: depositing a first material on a first face (A) of a substrate ; employing a first template having a first imprint pattern formed thereon to form a first pattern into the first material on the first face (A) of the substrate ; depositing a second material on a second face (B) of the substrate ; and employing a second template having a second imprint pattern formed thereon to form a second pattern into the second material on the second face (B) of the substrate , characterized in that the first pattern includes an incoupling grating and a first diffractive optical element, wherein the second pattern includes an unmodified portion aligned with the incoupling grating across the substrate , wherein the second pattern includes a second diffractive optical element aligned with the first diffractive optical element, wherein the first imprint pattern on the first template has a first portion having a first height and a second portion having a second height, the first and second heights being different, such that the first pattern formed into the first material has an incoupling grating having a first depth and a first diffractive optical element having a second depth, wherein the first portion of the first imprint pattern on the first template corresponds to the incoupling grating, wherein the second portion of the first imprint pattern on the first template corresponds to the first diffractive optical element, and wherein forming the first pattern and the second pattern on respective first face (A) and second face (B) of the substrate implements multiplexing of functions through the substrate such that different eyepiece functions are implemented without adversely affecting grating structure function. depositing a first material on a first face (A) of a substrate ; employing a first template having a first imprint pattern formed thereon to form a first pattern into the first material on the first face (A) of the substrate ; depositing a second material on a second face (B) of the substrate ; and employing a second template having a second imprint pattern formed thereon to form a second pattern into the second material on the second face (B) of the substrate , characterized in that the first pattern includes an incoupling grating and a first diffractive optical element, wherein the second pattern includes an unmodified portion aligned with the incoupling grating across the substrate , wherein the second pattern includes a second diffractive optical element aligned with the first diffractive optical element, wherein the first imprint pattern on the first template has a first portion having a first height and a second portion having a second height, the first and second heights being different, such that the first pattern formed into the first material has an incoupling grating having a first depth and a first diffractive optical element having a second depth, wherein the first portion of the first imprint pattern on the first template corresponds to the incoupling grating, wherein the second portion of the first imprint pattern on the first template corresponds to the first diffractive optical element, and wherein forming the first pattern and the second pattern on respective first face (A) and second face (B) of the substrate implements multiplexing of functions through the substrate such that different eyepiece functions are implemented without adversely affecting grating structure function. <EOS>