Light Filter Structure With Wedge Dielectric Layer
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Solution Overview
Problem
Traditional light filter structures face issues with spectrum deformation due to oblique incident light and are difficult to miniaturize to a few micrometers, failing to meet demands in various applications.
Innovation Solution
A light filter structure incorporating a substrate with photoelectric conversion elements, a dielectric-stacking layer with a wedge and flattening portion, and a flattening layer, which includes alternately stacked dielectric layers with varying refractive indices and light-shielding layers to control incident angles and enhance spectral resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional light filter structure is used, then the structure is simple, but spectrum deformation occurs due to oblique incident light
Solution Approach 1:
The light filter structure is segmented into multiple functional layers including a first light-shielding layer with first apertures, a second light-shielding layer with second apertures, and dielectric layers. Each layer serves a specific function in controlling light incidence angles and reducing spectrum deformation, transforming a simple single-layer structure into a multi-layer systematic solution.
Solution Approach 2:
Different regions of the light filter structure have different properties: the first light-shielding layer has first apertures with specific size ranges (1-150 μm) for controlling certain angle ranges, while the second light-shielding layer has second apertures with different size ranges for controlling other angle ranges. This local differentiation allows precise control over oblique incident light at different angles.
2Ease of manufacture
If traditional light filter structure is used, then the structure is easy to manufacture, but miniaturization to a few micrometers is difficult
Solution Approach 1:
The light filter structure employs a nested configuration where the first light-shielding layer with first apertures is positioned above the second light-shielding layer with second apertures, with dielectric layers in between. This nested multi-layer structure allows compact vertical stacking that achieves miniaturization while maintaining manufacturing feasibility through standard thin-film deposition and patterning processes.
Solution Approach 2:
The invention transitions from a planar two-dimensional filter structure to a three-dimensional multi-layer structure by stacking light-shielding layers and dielectric layers vertically. This dimensional change enables miniaturization in the horizontal plane while using the vertical dimension to accommodate multiple functional layers, achieving compact size without sacrificing manufacturing ease.
3Measurement precision
If dielectric-stacking layer with wedge portion is used, then spectral resolution is enhanced, but device complexity increases
Solution Approach 1:
The dielectric-stacking layer incorporates a wedge portion where the thickness of the dielectric layer varies continuously or non-continuously across the structure. This parameter change in thickness creates different optical path lengths for light passing through different regions, enhancing spectral resolution by separating wavelengths more effectively, while the wedge can be fabricated using standard deposition techniques with controlled thickness gradients.
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 reduces spectrum deformation from oblique light and allows for miniaturization, enhancing spectral resolution and reducing size limitations while maintaining low angle dependency.
Implementation Method 1
The light filter structure includes a dielectric-stacking layer disposed on the substrate. The dielectric-stacking layer has a wedge portion and a flattening portion adjacent to the wedge portion, the wedge portion has a continuously or non-continuously varied thickness
Implementation Method 2
The dielectric-stacking layer has a wedge portion and a flattening portion adjacent to the wedge portion, the wedge portion has a continuously or non-continuously varied thickness
Implementation Method 3
The light filter structure includes alternately stacked dielectric layers with varying refractive indices
Implementation Method 4
The light filter structure includes alternately stacked dielectric layers with varying refractive indices and light-shielding layers
Implementation Method 5
The light filter structure includes alternately stacked dielectric layers with varying refractive indices and light-shielding layers to control incident angles
Data Source
AI summary
A light filter structure is provided. The light filter structure includes a substrate having a plurality of photoelectric conversion elements. The light filter structure also includes a dielectric-stacking layer disposed on the substrate. The light filter structure further includes a flattening layer disposed on the dielectric-stacking layer. The dielectric-stacking layer has a wedge portion and a flattening portion adjacent to the wedge portion, the wedge portion has a continuously or non-continuously varied thickness, and the flattening portion has a substantially constant thickness.