Concave-Convex Optical Structure for Complex Sub-Wavelength Patterns
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Solution Overview
Problem
Existing optical diffractive elements with concave-convex structures formed by laser interference exposure cannot create complex concave-convex structures with multiple concavities or convexities, limiting their optical properties.
Innovation Solution
A concave-convex structure with a plurality of group portions, each containing multiple concavities or convexities, where the average widths and vertical lengths are controlled to be smaller than or equal to the visible light band, allowing for more complex arrangements and improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If laser interference exposure method is used to form concave-convex structure, then manufacturing process is simplified, but only simple interference patterns can be formed and complex concave-convex structures cannot be achieved
Solution Approach 1:
The patent divides the concave-convex structure into multiple group portions, where each group portion contains multiple concavities or convexities. This segmentation allows independent design and control of each group, enabling complex overall structures while maintaining manageable manufacturing processes for each segment.
Solution Approach 2:
The patent applies different characteristics to different group portions, allowing each group to have optimized local properties (such as different numbers, sizes, or arrangements of concavities/convexities). This local quality approach enables the structure to achieve complex overall functionality while each local group remains manufacturable using standard processes.
2Reliability
If concave-convex structure with smaller features is created to improve optical properties, then anti-reflection performance is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that average widths of areas occupied by concavities or convexities should be smaller than or equal to the wavelength of visible light, and average widths of group portions should be at least 0.2 μm. These partial specifications (not requiring all dimensions to be extremely small) achieve the necessary optical performance while maintaining manufacturability.
Solution Approach 2:
The patent establishes specific parameter ranges: average width ≤ visible light wavelength, average group width ≥ 0.2 μm, and controlled vertical lengths. By defining these parameter boundaries, the patent achieves optimal optical performance (anti-reflection properties) while ensuring the structure remains within manufacturable precision limits.
3Reliability
If multiple concavities or convexities are arranged in each group portion to increase structural complexity, then optical properties are improved, but device complexity increases
Solution Approach 1:
The patent segments the complex structure into multiple group portions, where each group contains multiple concavities or convexities. This segmentation allows the complex optical functionality to be distributed across manageable units, improving optical performance while keeping each individual group portion relatively simple to manufacture.
Solution Approach 2:
The patent combines multiple concavities or convexities within each group portion to create the desired complex optical functionality. By merging multiple simple features into grouped configurations, the patent achieves enhanced optical properties (such as improved anti-reflection through multiple interfaces) while maintaining a structured approach that manages overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The structure enables high accuracy and reproducibility in arranging and controlling concave-convex portions, enhancing optical properties such as anti-reflection and reducing light interference.
Implementation Method 1
optical members in which a concave-convex structure having an average cycle smaller than or equal to the wavelength of incident light is used have been widely developed. Since such a concave-convex structure exhibits properties principally different from those of a concave-convex structure having an average cycle larger than the wavelength of incident light
Implementation Method 2
it is expected that an optical member having higher properties can be achieved
Data Source
AI summary
Provided are a concave-convex structure including more complicated concave-convex structure, an optical member, and an electronic apparatus. The concave-convex structure includes a plurality of group portions each including a plurality of concavities or convexities provided in a surface of a base material, in which average widths of areas occupied by the concavities or convexities at the surface of the base material are smaller than or equal to a wavelength belonging to a visible light band.