Nanostructured Spectral Filter Manufacturing via Layered Rectangular Bars
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Solution Overview
Problem
Current manufacturing methods for spectral filters with patterns smaller than hundred nanometers result in rounded angles, leading to poorer optical properties such as reduced rejection ratio and selectivity, especially when the dimensions of the pattern arms are below 100 nm, due to technological limitations in the etching process.
Innovation Solution
A method involving the formation of spectral filters using rectangular bars of different materials with optical indices, where each bar is formed successively in a layer of the first material, allowing for sharp angles and improved optical properties by depositing and etching layers alternately to create a pattern of bars extending along different directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional etching methods are used to form patterns smaller than 100 nm, then manufacturing complexity is reduced, but manufacturing precision deteriorates due to rounded angles
Solution Approach 1:
The pattern formation process is segmented into multiple sequential steps: forming first bars in a first layer, depositing a second layer, and forming second bars in the second layer. This segmentation allows each bar to be formed with precise rectangular geometry through separate etching and filling operations, avoiding the rounded angles problem of traditional single-step etching while maintaining manufacturing feasibility
Solution Approach 2:
The invention transitions from forming patterns in a single layer to forming bars across multiple layers. By stacking rectangular bars vertically in different orientations (first bars in first layer, second bars in second layer), the solution achieves sharp angles through 3D structural arrangement rather than relying on planar etching precision alone
2Reliability
If pattern dimensions are reduced below 100 nm to achieve better optical properties, then light transmission and rejection ratios improve, but manufacturing precision deteriorates due to etching limitations
Solution Approach 1:
The method performs preliminary actions by first forming the first layer and first bars with precise geometry, then depositing the second layer before forming the second bars. This sequential preliminary formation allows each bar structure to be optimized independently with sharp rectangular geometry, ensuring high manufacturing precision even at sub-100 nm dimensions
Solution Approach 2:
The invention uses composite material structures with first bars made of one material and second bars made of another material, arranged in alternating orientations. This composite approach allows independent optimization of each bar's geometric precision while achieving the desired optical performance through the combined structure, overcoming the limitations of single-material single-step fabrication
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 method enhances the optical properties of spectral filters by achieving sharper angles and better light transmission and rejection ratios, making them more selective and less sensitive to light incidence angles, with improved performance compared to filters manufactured using traditional methods.
Implementation Method 1
depositing and etching layers alternately to create a pattern of bars
Data Source
AI summary
A spectral filter is manufactured using a process wherein a first rectangular bar is formed within a first layer made of a first material, said first rectangular bar being made of a second material having a different optical index. The process further includes, in a second layer over the first layer, a second rectangular bar made of the second material. The second rectangular bar is positioned in contact with the first rectangular bar. The second layer is also made of the first material.