Modified Cross-Section Fiber Antireflection Coating for Oblique Light
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Solution Overview
Problem
Existing antireflection coatings in optical devices fail to effectively reduce stray light at large incident angles and suffer from particle flaking due to insufficient binding between spherical particles and resin, leading to increased reflectance and flare or ghost issues.
Innovation Solution
An antireflection coating material using modified cross-section fibers with a core and protrusions, which are bound to a resin layer, ensuring strong adhesion and effective light scattering at large incident angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spherical fine particles are used in the antireflection coating, then the reflectance is reduced, but the particles easily come off due to small contact area with resin
Solution Approach 1:
The spherical particle is segmented into a polygonal cross-section structure with multiple flat surfaces. This segmentation increases the contact area between the particle and resin layer significantly compared to a spherical particle, thereby improving adhesion while maintaining the antireflection function through the polygonal geometry that scatters light effectively.
Solution Approach 2:
The invention uses a composite structure combining polygonal cross-section particles with a resin layer. The particle material and resin material are selected to have compatible refractive indices and surface properties, creating a composite antireflection coating that achieves both low reflectance and strong adhesion through the synergistic effect of the polygonal geometry and material composition.
2Object-affected harmful factors
If the incident angle is increased to test the coating performance, then the reflectance reduction effect becomes insufficient, but the coating structure remains the same
Solution Approach 1:
The invention replaces the spherical particle shape with a polygonal cross-section shape that has flat surfaces. This geometric modification allows the particle to effectively scatter light at larger incident angles by creating multiple reflection paths within the polygonal structure, thereby maintaining antireflection performance across a broader range of angles including large incident angles.
Solution Approach 2:
The polygonal cross-section particles create different local optical properties at their various surfaces. The flat surfaces of the polygon provide specific optical characteristics that are optimized for scattering light at oblique angles, whereas a spherical particle would provide uniform properties in all directions. This local quality variation enables effective performance at large incident angles.
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 coating achieves low reflectance of less than 0.2% at 85° and prevents particle flaking, effectively reducing stray light and minimizing flare or ghost in optical devices.
Implementation Method 1
Rays of light incident between the protrusions are reflected between the protrusions and are not imaged
Implementation Method 2
Rays of light incident between the protrusions are reflected between the protrusions
Implementation Method 3
the area of contact between the resin and the modified cross-section fiber is large, making it unlikely that the modified cross-section fiber will come off
Data Source
AI summary
An optical member includes an antireflection coating on a substrate. The antireflection coating includes a resin layer and a modified cross-section fiber bound to the resin layer. The modified cross-section fiber includes a core and a plurality of protrusions extending from the core. The protrusions of the modified cross-section fiber have extremities protruding from a surface of the resin layer.