Meta Lens Nanostructure Coating for Mass Production
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Solution Overview
Problem
Current methods for mass-producing meta lenses face challenges in achieving desired optical performance across the entire visible light range due to limitations in patterning resolution and usable materials, particularly in producing meta lenses with high refractive index nanostructures.
Innovation Solution
A meta lens is manufactured using a substrate with nanostructures coated with a high refractive index atomic layer, such as TiO2, and a UV curable resin, where the thickness of the atomic layer is optimized for high polarization conversion efficiency, and a method involving a master stamp, replica mold, and imprinting process is employed for mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional lithography methods (i-line stepper, KrF stepper) are used for mass production, then manufacturing cost is reduced and productivity is improved, but patterning resolution is insufficient and optical performance across the entire visible light range cannot be achieved
Solution Approach 1:
The patent uses a master stamp with high-precision nanostructures (fabricated by electron beam lithography) to create replica molds, which are then used for mass production through imprinting. This copying approach transfers the high precision from the master stamp to mass-produced meta lenses, overcoming the resolution limits of conventional lithography while maintaining mass production capability
Solution Approach 2:
The patent performs preliminary high-precision patterning to create the master stamp before mass production. The master stamp serves as a pre-fabricated template that enables subsequent mass production runs to achieve high precision without repeating the complex electron beam lithography process for each lens
2Ease of manufacture
If conventional lithography methods are used, then manufacturing process is simplified, but usable materials are limited and high refractive index nanostructures cannot be produced
Solution Approach 1:
The patent separates the manufacturing process into two distinct stages: (1) master stamp fabrication using electron beam lithography with flexible material selection, and (2) mass production using the replica mold with simple imprinting. This segmentation allows material optimization in the master stamp creation while maintaining process simplicity for mass production
Solution Approach 2:
The replica mold acts as an intermediary between the master stamp and the final meta lenses. It transfers the nanostructure pattern while allowing the use of UV curable resin in the mass production step, thus bridging the gap between high-precision patterning and material versatility
3Productivity
If existing mass production methods are used, then production volume is increased, but polarization conversion efficiency is limited to about 50%
Solution Approach 1:
The patent optimizes the geometric parameters of the nanostructures (width, height, pitch) and the imprinting process parameters (pressure, temperature, UV curing conditions) to achieve polarization conversion efficiency of 70% or more. This involves precise control of the nanostructure dimensions and the replication process to maintain optical performance at scale
Solution Approach 2:
The replica mold accurately copies the optimized nanostructure geometry from the master stamp, preserving the precise dimensional parameters that enable high polarization conversion efficiency. This copying process maintains the optical performance characteristics while enabling mass production
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 solution enables meta lenses with enhanced polarization conversion efficiency and improved mechanical strength, allowing for efficient light modulation across the visible spectrum and high-yield mass production, surpassing existing methods which typically achieve only 50% efficiency.
Implementation Method 1
A thickness of the high refractive index atomic layer may be determined such that a polarization conversion efficiency of green light by the nanostructures coated with the high refractive index atomic layer is 70% or more
Implementation Method 2
forming a nanostructure layer including the plurality of nanostructures by imprinting the replica mold on a UV curable resin
Data Source
AI summary
A meta lens includes a substrate, a plurality of nanostructures provided on the substrate, and a high refractive index atomic layer formed along surfaces of the plurality of nanostructures and including a material having a refractive index greater than a refractive index of the plurality of nanostructures.