Abstract
We developed an off-axis diffractive lens using a micro-mirror array on a flat substrate. MMA creates an on-axis converging beam from a 45 degrees off-axis diverging illumination beam and functions similar to a large and bulky elliptical mirror. The array consists of individual micro-mirrors with normal directions that vary across the component. The size, normal direction and the center height of each micro-mirror are optimized to achieve a phase matching condition so that the smallest focal spot size is achieved at the design wavelength. Design can also be optimized for full color applications using a synthetic design wavelength. A sample MMA of size 3 mm by 5 mm is fabricated using grayscale lithography. The designed MMA is used to illuminate a computer-generated hologram in a near-eye display system. Experimental results verify the premises of the designed component.
Highlights
In the design of augmented reality (AR) near-eye displays, it is desired to have a wide fieldof-view (FOV) and small form factor [1]
For full-color applications, a synthetic design wavelength is defined as the least common multiple of red, green and blue wavelengths
Experimental results To perform the experiments, we fabricated a sample part with a size of 3 mm by 5 mm using gray-scale lithography on a photo-resist polymer placed on a 1 mm thick N-BK7 glass substrate
Summary
In the design of augmented reality (AR) near-eye displays, it is desired to have a wide fieldof-view (FOV) and small form factor [1]. The center height of each micro-mirror has a nanometer scale difference with respect to the adjacent micro-mirrors to satisfy the phase matching condition, where the fields interfere constructively at the focal plane.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
