Diffractive Optical Element Pixel Layouts With Reduced Edge Roughness
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Solution Overview
Problem
Existing DOE manufacturing processes face challenges in achieving high optical performance due to line edge roughness and computational complexity, particularly with small pixel sizes, which can lead to increased scattering and production difficulties.
Innovation Solution
The method involves approximating the contour of pixel clusters in the layout design by a single polygon, reducing edge numbers and zig-zag portions, and using a modified pixel layout to fabricate a master tool with straight lines changing direction at specific angles, thereby reducing line edge roughness and computational requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional pixel layout design with regular polygon pixels is used, then the DOE structure can be formed, but line edge roughness increases and optical performance deteriorates
Solution Approach 1:
The pixel layout is segmented into clusters, where each cluster is approximated by a single polygon with reduced edges. This segmentation approach transforms the detailed pixel-by-pixel structure into coarser cluster polygons, reducing line edge roughness while maintaining the essential optical functionality through controlled direction changes at specific angles.
2Adaptability or versatility
If small pixel sizes are used to achieve complex optical designs, then design complexity increases, but computational requirements and memory usage increase significantly
Solution Approach 1:
Multiple adjacent pixels are merged into single polygon clusters, reducing the total number of discrete elements. This merging maintains the overall optical design complexity by preserving direction change angles, while significantly reducing computational requirements and memory usage by eliminating redundant pixel-level details.
3Manufacturing precision
If high-resolution pixel layouts are used, then optical precision can be maintained, but production difficulty and manufacturing complexity increase
Solution Approach 1:
The polygon approximation applies local quality control by maintaining precise direction change angles at critical locations while using coarser polygon boundaries in less critical areas. This approach preserves optical precision where needed (at direction changes) while simplifying the overall manufacturing process through reduced edge complexity.
Data Source
AI summary
The present disclosure describes diffractive optical elements (DOEs) and master tools for producing the DOEs. In one aspect, the disclosure describes a method that includes modifying a first pixel layout design for diffractive optical elements to obtain a modified pixel layout design. The first pixel layout design comprises pixels, each of which has a shape of a regular polygon (e.g., a rectangular shape). Modifying the first pixel layout design includes approximating a shape contour of a cluster of pixels in the first pixel layout design by a single polygon that reduces a total number of edges relative to the shape contour of the cluster of pixels in the first pixel layout design. The method also includes using the modified pixel layout design to form a master tool for production of the diffractive optical elements.