Optical Filter With Bidirectional Incremental Refractive Index Modules
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Solution Overview
Problem
Conventional optical filters with refraction layers of two refractive indexes with a large difference are unable to meet various different requirements effectively.
Innovation Solution
An optical filter design that includes a substrate, an adhesion layer with a refractive index less than 1.42, and a matching composite layer with a sequence of first, second, and third refraction layers, where the refractive index gradually increases in both directions through bidirectional and unidirectional incremental modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical filters use refraction layers with two refractive indexes having a relatively large difference, then the filter structure is simple, but the filter cannot meet different requirements effectively
Solution Approach 1:
The matching composite layer is divided into multiple refraction layers (first, second, and third refraction layers) with different refractive indexes, where each layer has a specific refractive index range. This segmentation allows the filter to meet different optical requirements by selecting appropriate layer combinations while maintaining a structured and manageable design.
Solution Approach 2:
Different refraction layers are assigned different refractive indexes locally within the matching composite layer. The first refraction layers have a first refractive index, the second refraction layers have a second refractive index greater than the first, and the third refraction layers have a third refractive index greater than the second. This local differentiation enables the filter to achieve various optical configurations for different applications.
2Object-affected harmful factors
If conventional optical filters use refraction layers with two refractive indexes, then the manufacturing process is simple, but the average reflectance cannot be reduced effectively
Solution Approach 1:
The matching composite layer combines multiple refraction layers with different refractive indexes (first, second, and third refraction layers) in a composite structure. This composite material approach reduces average reflectance by creating a gradual refractive index transition, while the standardized layer configuration maintains manufacturing feasibility.
Solution Approach 2:
The patent changes the refractive index parameter across different layers within the matching composite layer. By specifying that the second refractive index is greater than the first, and the third refractive index is greater than the second, the design enables reflectance reduction through parameter variation while keeping the manufacturing process manageable through defined layer sequences.
3Adaptability or versatility
If conventional optical filters use refraction layers with two refractive indexes, then the design is straightforward, but the spectrum range cannot be expanded effectively
Solution Approach 1:
The matching composite layer is segmented into multiple refraction layers with progressively increasing refractive indexes. This segmentation allows the filter to expand the spectrum range by utilizing different refractive index combinations for different wavelength regions, while the modular layer structure keeps the design organized and manageable.
Solution Approach 2:
Different local regions of the matching composite layer contain refraction layers with specific refractive indexes tailored for different spectral regions. The first, second, and third refraction layers provide local optical properties that collectively expand the overall spectrum range while maintaining a systematic design approach.
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 optical filter achieves a distribution of refractive index that allows for various optical configurations, reducing average reflectance and expanding the spectrum range effectively.
Implementation Method 1
A conventional optical filter includes a plurality of refraction layers that are stacked in sequence and that have two refractive indexes having a relatively large difference therebetween
Implementation Method 2
the N number of the films include a plurality of first refraction layers, a plurality of second refraction layers, and a plurality of third refraction layers. Each of the first refraction layers has a first refractive index that is greater than the refractive index of the adhesion layer. Each of the second refraction layers has a second refractive index that is greater than the first refractive index
Data Source
AI summary
An optical filter includes a substrate, an adhesion layer formed on the substrate, and a matching composite layer formed on the adhesion layer and including a plurality of first refraction layers, a plurality of second refraction layers, and a plurality of third refraction layers. A quantity of the second refraction layers is less than that of the first refraction layers, and is less than that of the third refraction layers. A refractive index of the first refraction layer is greater than that of the adhesion layer. A refractive index of the second refraction layer is greater than that of the first refraction layer, and is less than that of the third refraction layer. Two of the second refraction layers sandwich one of the first refraction layers therebetween, and are sandwiched between two of the third refraction layers, so as to be jointly defined as a bidirectional incremental module.