Aspherical GRIN Lens Aberration Correction via Segmented Polymer Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional GRIN lenses lack the ability to achieve large corrections of lens aberrations and unique optics due to their spherical surfaces, limiting their performance compared to aspherical designs.
Innovation Solution
The development of an aspherical GRIN lens with a designer GRIN distribution, fabricated using a multi-stage process involving hierarchically multilayered polymer composite films, where each film has a different refractive index, assembled into a multilayered composite GRIN sheet and shaped into an aspherical lens, allowing for tailored refractive index gradients and aberration corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional spherical GRIN lenses are used, then the lens structure is simple and easy to manufacture, but the ability to correct lens aberrations is limited
Solution Approach 1:
The lens is divided into multiple layers with different refractive indices, where each layer contributes to correcting specific aberrations. The segmented structure allows independent optimization of each layer's optical properties while maintaining overall aberration correction performance.
Solution Approach 2:
Different regions of the lens are assigned different refractive indices and optical properties. The lens features a gradient refractive index distribution where the center and periphery have different optical characteristics, enabling localized correction of specific aberrations in different zones of the lens.
2Manufacturing precision
If aspherical surfaces are introduced to improve aberration correction, then optical performance improves, but manufacturing complexity increases
Solution Approach 1:
The aspherical lens is constructed from multiple segmented layers with different refractive indices, allowing the complex aspherical surface to be achieved through assembly of simpler individual layers rather than monolithic fabrication.
Solution Approach 2:
The lens uses composite materials with different refractive indices arranged in specific patterns. This composite structure enables the aspherical optical performance to be achieved through material composition rather than solely through complex surface shaping.
3Adaptability or versatility
If a designer GRIN distribution is implemented, then unique optical properties are achieved, but the fabrication process becomes more complex
Solution Approach 1:
The desired GRIN distribution is achieved by segmenting the lens into multiple layers, each with a specific refractive index. This segmentation allows the complex gradient profile to be constructed from simpler individual layers that can be fabricated using standard processes.
Solution Approach 2:
The refractive index parameter is varied across different layers to create the desired GRIN distribution. By changing the refractive index parameter in a controlled manner across layers, the lens achieves unique optical properties while using manageable fabrication processes.
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 approach enables larger corrections of lens aberrations and the production of unique optics with performance unachievable with spherical surfaces, suitable for various applications including imaging, energy collection, and biological implants, offering improved focal lengths and aberration correction.
Implementation Method 1
In a GRIN lens, there is a continuous variation of the refractive index within the lens material. The light rays are continuously bent within the lens. The focusing properties are determined by the variation of refractive index within the lens material.
Data Source
Figure 1
Figure 2
AI summary
A method of fabricating an aspherical gradient refractive index lens includes co-extruding a first polymer material having a first refractive index and a second polymer material having a second refractive index different than the first refractive index to form multilayered polymer composite films, assembling the multilayered polymer composite films into a multilayer composite GRIN sheet and shaping the multilayered composite GRIN sheet into an aspherical lens.