3D Laser Lithography Dose Control for Smooth Microstructure Surfaces
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Solution Overview
Problem
Laser lithography methods face inaccuracies and design limitations due to step-like surface courses and bulging effects in micro- or nanostructures, particularly when producing densely packed structures, leading to deviations between intended and actual structures.
Innovation Solution
A method utilizing multi-photon absorption in laser lithography, where the exposure dose is varied in edge portions of partial structures to compensate for inaccuracies and achieve desired surface structures, allowing for precise control of voxel size and surface progression without the need for stepwise substrate lowering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the overall structure is divided into multiple partial structures written sequentially, then the manufacturing precision is improved, but the productivity deteriorates due to increased process time
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-defining the exposure dose distribution across different regions (edge portions vs. inner portions) before the actual writing process. The method determines in advance which regions require higher or lower exposure doses based on their position in the partial structures, allowing the laser writing process to proceed more efficiently without real-time adjustments, thus reducing overall process time while maintaining precision.
Solution Approach 2:
The patent implements local quality by applying different exposure doses to different regions of the partial structures. Specifically, edge portions receive a first exposure dose while inner portions receive a second exposure dose. This localized differentiation allows each region to be optimized for its specific function, improving overall structural accuracy without requiring uniform high-resolution writing across the entire structure.
2Manufacturing precision
If a finer screening of the structure is applied to areas with strong contour changes, then the manufacturing precision is improved, but the productivity deteriorates due to increased computational effort
Solution Approach 1:
The patent applies local quality by differentiating between edge portions and inner portions of partial structures, assigning different exposure doses based on their spatial characteristics. This approach focuses computational and processing resources on regions that require higher precision (edge portions with contour changes) while using standard processing for inner portions, thereby improving surface accuracy without uniformly increasing computational effort across the entire structure.
3Productivity
If structural details are written in immediate proximity one after another, then the productivity is improved, but the manufacturing precision deteriorates due to bulging effects from excessive energy input
Solution Approach 1:
The patent implements local quality by assigning different exposure doses to different regions within the partial structures. Inner portions, which are more susceptible to bulging effects from cumulative energy input, receive a reduced second exposure dose compared to the first exposure dose applied to edge portions. This allows rapid sequential writing to maintain productivity while preventing excessive energy accumulation and dimensional distortion in vulnerable regions.
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 accurate approximation of complex surface structures with reduced process time by adjusting the exposure dose in edge portions, minimizing step effects and bulging, and allowing for continuous surface progressions.
Implementation Method 1
an exposure dose is irradiated into the lithography material in a spatially resolved manner in a focal region of a laser writing beam, utilizing two-photon absorption or, in general, multi-photon absorption
Implementation Method 2
an exposure dose is irradiated into the lithography material in a spatially resolved manner in a focal region of a laser writing beam, utilizing two-photon absorption or, in general, multi-photon absorption
Data Source
AI summary
A system, computer program product and method for producing a three-dimensional overall structure by means of laser lithography, the overall structure being approximated by at least one partial structure, wherein, for the purposes of writing the partial structure, an exposure dose is radiated into the lithography material in a focal region of a laser writing beam while exploiting multi-photon absorption. Here, in the partial structure, the exposure dose in those edge portions that immediately adjoin an external surface of the overall structure to be produced is modified in comparison with the remaining partial structure.