Our dot projector metalenses are based on the Dammann grating principle. The Dammann grating can split a single incident beam into multiple beams with equal intensity through phase modulation. In this application, the metalens is designed to replicate the input light spot into multiple copies with high uniformity.
The key features of the design include:
When the input light from a VCSEL passes through the metalens, the carefully designed phase structure creates multiple diffraction orders, resulting in an array of equally spaced and intensity-balanced light spots. This enables efficient replication of the input beam pattern without the need for complex optical systems.
Our dot projector metalensesis specifically designed to replicate and project multi-aperture VCSEL arrangements onto target planes. The projection characteristics are determined by the dimensional configuration of the rectangular frame encompassing the light apertures. When all light apertures are enclosed within a rectangular frame, the dimensions of this rectangle will determine the stitching effect. There are three types of stitching effects: 1. Seamless stitching; 2. Gapped stitching; 3. Overlapping stitching
We will take MCPD357-940 as an example to explain the types of stitching effects.
When light apertures are positioned within a rectangular frame measuring 229×199μm (with frame boundaries intersecting the centers of peripheral apertures), the system produces a seamlessly integrated projection pattern with no visible discontinuities.
Operating with a reduced frame size of 214×186μm produces distinct separation between projected elements. This mode is useful for applications requiring clear delineation between projection segments.
Utilizing an expanded frame size of 244×212μm creates intentional overlap between adjacent projections. This mode ensures complete coverage with redundancy in the projection pattern.
Our dot projectors are Dammann grating-based metalenses that replicates VCSEL light patterns with uniform intensity distribution. It operates in three modes controlled by frame dimensions: seamless, gapped, and overlapping stitching. The frame boundaries are defined by the centers of outermost light apertures. Pattern characteristics remain consistent across the projection field. This flexibility, combined with high diffraction efficiency and precise pattern control, makes the metalens projectors a versatile solution for advanced optical applications.
