Meta Optical Device Design Method for Phase Defect Elimination
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Solution Overview
Problem
Current meta optical devices face challenges in achieving optimal optical performance due to phase defects in nanostructure dimensions, which affect the phase change and refractive properties, leading to suboptimal light manipulation and focusing capabilities.
Innovation Solution
A method for designing meta optical devices involves setting design data for nanostructure dimensions based on optical performance, identifying and substituting phase defect regions with normal values to correct phase changes, ensuring monotonic phase distribution and improved refractive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nanostructure dimensions are designed based on optical performance requirements, then light manipulation capability is improved, but phase defects occur in certain dimension regions causing suboptimal performance
Solution Approach 1:
The patent extracts and removes the problematic phase defect regions from the design space by identifying dimension ranges where phase wrapping occurs and excluding these ranges from the manufacturable design region. This allows the device to operate only in dimension regions that produce monotonic phase changes without phase defects.
Solution Approach 2:
The patent applies different design constraints to different regions of the parameter space. Specifically, it identifies that certain dimension ranges (phase defect regions) should be avoided entirely, while other ranges (normal regions) are suitable for design. This local quality approach ensures that each region of the device operates in its optimal dimension range.
2Manufacturing precision
If phase defect regions are identified and avoided by substituting with normal region values, then phase distribution uniformity is improved, but design flexibility is reduced
Solution Approach 1:
The patent changes the parameter selection strategy by introducing a constraint on the dimension parameter. Instead of allowing any dimension value, it restricts the parameter to specific ranges (normal regions) that avoid phase defects. This parameter change ensures monotonic phase distribution while maintaining design capability within the constrained ranges.
Data Source
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AI summary
A method of designing a meta optical device is provided. The method includes: setting, via a processor, design data for arrangement and dimensions of a nanostructure of the meta optical device, according to a function to be implemented by the meta optical device; obtaining a phase change graph with respect to a change in the dimensions; setting a shape dimension region with phase defect in the phase change graph; and substituting a shape dimension with phase defect, which is included in the shape dimension region with phase defect among the dimensions included in the design data, with a substitution value that is outside the shape dimension region with phase defect. Accordingly, a meta optical device having no phase defect is implemented.