Diffractive AR waveguide made by injection molding

Smart glasses incorporating waveguides made of polymers have emerged in recent years. They are created by nanoimprinting and are capable of practical use. However, if smart glasses become widely adopted in the future, their ability to meet the demands of mass production and cost efficiency remains uncertain. Injection molding is a well-known method for mass production and cost efficiency, but its ability to deliver the required performance is unclear. To satisfy these requirements, we have developed a technology that improves the new microstructure and reduces surface waviness, which are essential for enhancing resolution and optical efficiency, particularly in monochromatic waveguides. Measurement results show that we are able to improve optical efficiency and MTF as designed. Future challenges include achieving thinner thickness and higher precision molding, as well as improving the quality of projected images.