Diffractive Optical Element with Localized Inorganic Film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Diffractive optical elements using resin materials face challenges in maintaining high optical performance while reducing aging degradation due to permeation and dissolution of organic components, leading to deteriorated diffraction efficiency over time.
Innovation Solution
A diffractive optical element design featuring a first resin portion with a diffraction grating, a transparent inorganic film with varying thickness, and a second resin portion, where the transparent inorganic film is thicker at the grating tip than on the grating surface, preventing material permeation and dissolution while maintaining initial optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a resin material is used for the diffractive optical element, then ease of manufacture and cost are improved, but aging deterioration occurs due to permeation and dissolution of organic components
Solution Approach 1:
A transparent inorganic film is introduced as an intermediary barrier layer between the first resin portion and the second resin portion. This inorganic film prevents permeation and dissolution of organic components from the second resin into the first resin, thereby blocking the aging deterioration pathway while maintaining the ease of manufacturing resin-based diffractive optical elements.
Solution Approach 2:
The invention creates a composite structure combining organic resin materials with an inorganic film layer. This composite design leverages the manufacturing advantages of resin materials while incorporating the superior aging resistance and barrier properties of inorganic materials, achieving both ease of manufacture and long-term reliability.
2Reliability
If the transparent inorganic film thickness is increased to prevent permeation, then aging resistance is improved, but optical performance deteriorates due to excessive thickness
Solution Approach 1:
The transparent inorganic film is designed with non-uniform thickness distribution, being thicker at the grating tip region where permeation occurs and thinner at other grating surfaces. This local quality variation provides sufficient barrier protection where needed while maintaining optimal optical performance in other regions, avoiding the trade-off between thickness and optical quality.
3Manufacturing precision
If a uniform thin transparent inorganic film is formed on the diffractive optical element, then optical performance is maintained, but permeation and dissolution of organic components cannot be prevented
Solution Approach 1:
Instead of a uniform thin film, the transparent inorganic film is formed with varied thickness: thicker at the grating tip where organic component permeation occurs and thinner at other grating surfaces. This local thickness variation provides enhanced permeation barrier at critical regions while maintaining good optical performance across the entire element.
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
This configuration reduces aging deterioration and maintains high diffraction efficiency across a wide wavelength range, ensuring the optical performance of the diffractive optical element remains effective over time.
Implementation Method 1
preventing material permeation and dissolution while maintaining initial optical performance
Implementation Method 2
diffractive optical element having diffraction function
Data Source
AI summary
A diffractive optical element includes a first resin portion having a first diffraction grating and made of a first resin material, a second resin portion having a second diffraction grating formed to cover the first diffraction grating and made of a second resin material, and a transparent inorganic film formed on an optically effective surface, which is an interface between the first diffraction grating and the second diffraction grating, wherein a thickness of the transparent inorganic film at a grating tip of the first diffraction grating is thicker than a thickness of the transparent inorganic film at a grating surface other than the grating tip of the first diffraction grating.