Method for manufacturing light guide elements

A method comprising:

• depositing a photoresist material on a substrate;
• overlaying a first mask on the photoresist material, wherein the first mask defines a first feature;
• overlaying a second mask on the first mask, wherein the second mask defines a second feature;
• causing a light source to illuminate the photoresist material through the first mask and the second mask, wherein the light source is positioned at a first angle, wherein the first angle comprises a non-normal angle with respect to a plane parallel to the substrate;
• removing the second mask;
• overlaying a third mask on the first mask, wherein the third mask defines a third feature;
• causing the light source to illuminate the photoresist material through the third mask and the first mask during an initial exposure;
• developing the photoresist material so as to retain an elongate portion of the photoresist material on the substrate, wherein a first end of the elongate portion comprises an angled portion, and wherein the angled portion is sloped at an angle with respect to a long axis of the elongate portion;
• overlaying a fourth mask on the developed photoresist material, wherein the fourth mask defines a fourth feature to correspond to the angled portion;
• and
• depositing a reflective material through the fourth mask onto the angled portion.