Microlens Array Parallel Micropatterning for Faster Feature Arrays
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Solution Overview
Problem
Existing methods for micropatterning, such as laser ablation and two-photon polymerization, are inefficient for forming arrays of multiple features, as they require scanning a single laser beam, making it time-consuming to create thousands or millions of features like LEDs for displays.
Innovation Solution
The use of microlens arrays to generate multiple laser sub-beams from a single laser beam, allowing for parallel micropatterning by focusing each sub-beam onto a substrate or wafer, enabling simultaneous creation of features or holes with controlled shapes and patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single laser beam is scanned to form multiple features, then flexibility for forming individual features is provided, but processing time increases significantly
Solution Approach 1:
The patent divides a single laser beam into multiple sub-beams using a microlens array, with each lenslet generating a separate focused spot. This segmentation allows simultaneous processing of multiple features rather than sequential scanning, directly resolving the contradiction by maintaining versatility while dramatically improving productivity through parallel operations
Solution Approach 2:
The patent transitions from one-dimensional sequential scanning to two-dimensional parallel processing by using an array of lenslets that simultaneously focus multiple beams across the substrate. This dimensional change enables multiple features to be formed at different spatial positions at the same time, eliminating the time penalty of sequential scanning while preserving design flexibility
2Manufacturing precision
If a single laser beam is scanned to form arrays of thousands or millions of LEDs, then individual feature formation is achieved, but the process becomes very time-consuming
Solution Approach 1:
The microlens array segments the single laser beam into thousands of independent sub-beams, each capable of forming a precise feature. This allows simultaneous formation of thousands of LED features rather than scanning one at a time, maintaining manufacturing precision through consistent focal spot generation while reducing processing time by factors of thousands through parallel operation
Solution Approach 2:
The patent uses the microlens array to create multiple copies of the laser beam's focal spot across the substrate. Each lenslet acts as a independent copying element, reproducing the focused beam pattern at multiple locations simultaneously. This copying approach enables mass production of identical features without the time penalty of sequential scanning, while maintaining precision through consistent optical replication
3Productivity
If multiple laser sub-beams are generated using a lenslet array, then parallel micropatterning efficiency is improved, but device complexity increases
Solution Approach 1:
The microlens array serves multiple functions simultaneously: it acts as a beam splitter, a focusing element array, and a spatial pattern generator. This multi-functionality consolidates what would otherwise require multiple separate optical systems into a single component, achieving parallel processing capability without proportionally increasing overall system complexity
Solution Approach 2:
The microlens array acts as an intermediary optical element that transforms a single input beam into multiple output sub-beams. This intermediary component simplifies the system architecture by providing a single point of transformation rather than requiring complex multi-beam generation and steering mechanisms, thereby achieving parallel processing with minimal added complexity
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 significantly reduces processing time and ensures consistent shape and size of features, improving efficiency in creating arrays of features like LEDs for display technologies.
Implementation Method 1
providing the laser beam to a lenslet array including a plurality of lenslets, and generating, from the laser beam, a plurality of laser sub-beams using the lenslet array
Implementation Method 2
Each lenslet of the plurality of lenslets has the same shape
Implementation Method 3
The plurality of features may be formed by two-photon polymerization of the material formed on the substrate
Implementation Method 4
directing the plurality of laser sub-beams toward a wafer to generate or modify a plurality of holes through the wafer
Data Source
AI summary
Disclosed herein are systems and methods for using microlens arrays for parallel micropatterning of features. A method includes emitting a laser beam providing the laser beam to a lenslet array including a plurality of lenslets, and generating, from the laser beam, a plurality of laser sub-beams using the lenslet array. Each one of the plurality of laser sub-beams is generated by a corresponding one of the plurality of lenslets. Each lenslet of the plurality of lenslets has the same shape.