3D Substructure Formation Sequence to Minimize Laser Light Clipping
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Solution Overview
Problem
Multiphoton lithography faces issues with laser light beam clipping when forming structures in close proximity to previously formed substructures due to refractive index changes, leading to incomplete curing, especially near the base and improving towards the top.
Innovation Solution
The method involves directing laser light through a photopolymerizable material to form substructures with vertical walls, where subsequent substructures have a shorter horizontal wall extension if another substructure is to be attached, minimizing light clipping by controlling the sequence of substructure formation based on their relative locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If substructures are formed in close proximity to previously formed substructures, then productivity is improved by reducing the number of steps, but manufacturing precision deteriorates due to light clipping and incomplete curing
Solution Approach 1:
The method performs preliminary planning of the substructure formation sequence before actual fabrication. By analyzing the three-dimensional structure and determining an optimal formation sequence in advance, the system prevents light clipping issues before they occur, ensuring complete curing while maintaining high productivity
Solution Approach 2:
The invention dynamically adjusts the formation sequence of substructures based on their spatial relationships. Rather than using a fixed layer-by-layer approach, the system adaptively determines which substructure to form next based on the current state and predicted light path interactions, optimizing both precision and efficiency
2Device complexity
If substructures are formed with vertical walls directly attached to each other, then device complexity is reduced by simplifying the structure, but manufacturing precision deteriorates due to light refraction at interfaces
Solution Approach 1:
The system performs preliminary sequence determination to identify potential light clipping issues at vertical interfaces before fabrication. By planning the formation order in advance, it ensures that substructures are formed in an order that minimizes refraction-induced clipping, maintaining both structural simplicity and manufacturing precision
Solution Approach 2:
The invention changes the temporal parameter of substructure formation by adjusting the sequence in which substructures are created. This parameter change allows vertical walls to be directly attached without compromising curing completeness, as the formation sequence is optimized to prevent light refraction issues
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 effectively minimizes light clipping, ensuring complete curing of substructures with minimal to no clipping, allowing for the formation of complex three-dimensional structures with varied shapes.
Implementation Method 1
laser light beam passes through an area with non-uniform refractive indices... the material as it crosslinks
Data Source
AI summary
A method of making a three-dimensional structure including substructures is provided. The method includes directing laser light from a microscope objective through a photopolymerizable material to form a plurality of substructures each having at least one vertical wall directly attached to a vertical wall of an adjacent substructure. The substructures are individually formed in a sequence such that any second substructure that is formed in a location vertically disposed between the microscope objective and a first substructure has a wall that extends horizontally a shorter distance than a wall of the first substructure if a third substructure will subsequently be formed directly attached to the wall of the first substructure. The method is useful for minimizing passing laser light through a portion of an already formed substructure during formation of the three-dimensional structure.