2D Nanoscale Patterns via Sequential 1D Lithography Exposures
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Solution Overview
Problem
Existing photolithographic processes for creating 2D illumination patterns are inefficient, requiring long process times for generating large-scale 2D grating patterns, and often necessitate separate masks for each variation of design parameters.
Innovation Solution
A method involving multiple exposures using one or more 1D masks or holographic interference lithography to generate 2D periodic nanoscale patterns, allowing for faster manufacturing of 2D masks and increased flexibility in pattern generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional photolithographic processes are used to create 2D illumination patterns, then manufacturing precision can be maintained, but process time becomes excessively long and productivity decreases
Solution Approach 1:
The patent divides the 2D pattern creation process into multiple sequential 1D exposures. Instead of attempting to create the entire 2D pattern in a single step, the method segments the pattern into multiple one-dimensional feature sets that are exposed separately and combined, thereby maintaining precision while reducing overall process time.
Solution Approach 2:
The patent transitions from working exclusively in two dimensions to incorporating a temporal dimension through multiple sequential exposures. By adding the time dimension to the process, complex 2D patterns can be built up from simpler 1D exposures, improving both speed and flexibility without sacrificing precision.
2Manufacturing precision
If separate masks are used for each variation of design parameters, then manufacturing precision is maintained, but device complexity and cost increase
Solution Approach 1:
The patent makes a single 1D mask multi-functional by using it in multiple orientations and configurations to create various 2D patterns. The same physical mask can generate different patterns by rotating it or changing exposure parameters, eliminating the need for separate masks for each pattern variation and reducing overall system complexity.
Solution Approach 2:
The patent introduces dynamic reconfiguration of the masking system through rotation mechanisms and adjustable exposure parameters. A single static mask becomes dynamically versatile, able to produce multiple pattern variations by changing its orientation or exposure conditions, thereby reducing the number of physical masks needed.
3Productivity
If multiple exposures are used to create 2D patterns from 1D masks, then productivity and flexibility improve, but process complexity increases
Solution Approach 1:
The patent employs computational algorithms that automatically optimize exposure parameters, calculate rotation angles, and determine sequencing for multiple exposures. This self-service computational layer manages the complexity of coordinating multiple exposures, allowing the physical exposure process itself to remain relatively simple while achieving high productivity and flexibility.
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 faster and more cost-effective creation of 2D masks used in optical diffraction gratings, semiconductor fabrication, and other applications, while also improving flexibility and speed in research and development.
Implementation Method 1
photolithography or optical lithography is a general term used for techniques that use light to produce minutely patterned thin films of suitable materials over a substrate
Implementation Method 2
The photoresist either breaks down or hardens where it is exposed to light
Implementation Method 3
holographic interference lithography
Implementation Method 4
The patterned film is then created by removing the softer parts of the coating with appropriate solvents
Data Source
AI summary
Systems and methods are provided for generating a two-dimensional pattern on a photoresist layer. A photoresist layer is exposed via a first exposure to a first unidimensional series of features alternatingly providing first minima and maxima of illumination intensity along a first dimension. The photoresist layer is then exposed via a second exposure to a second unidimensional series of features alternatingly providing second minima and maxima of illumination intensity along a second dimension that is angularly separated from the second dimension by an exposure rotation factor.