Substrate Alignment in Imprint Lithography
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Solution Overview
Problem
Current nano-fabrication techniques, such as imprint lithography, face challenges in achieving precise alignment and concentric patterning on substrates due to manufacturing variations in substrate and shaft dimensions, leading to misalignment and non-circular rotation, which affects the quality of patterned features.
Innovation Solution
The implementation of a lithographic system that uses a laser emitter and photo-electric detector to determine the inner diameter of the substrate and calculate the radius difference with the shaft, allowing for precise positioning and concentric imprinting of patterned features, combined with stabilizers for mechanical reinforcement and adjustment to compensate for alignment errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional imprint lithography is used without compensation mechanisms, then the process is simple and fast, but manufacturing precision deteriorates due to misalignment and non-circular rotation caused by substrate and shaft dimension variations
Solution Approach 1:
The system performs preliminary measurement of substrate inner diameter and shaft diameter using laser emitter and photo-electric detector before the imprinting process. The radius difference is calculated in advance and used to determine compensating displacement amounts, ensuring precise concentric alignment is achieved before patterning begins
Solution Approach 2:
The system incorporates feedback mechanisms where the measured substrate and shaft dimensions are used to calculate compensation values that are fed back into the positioning system. The stage displacement amounts are adjusted based on the actual measured values to maintain precise concentricity throughout the imprinting process
2Manufacturing precision
If substrate and shaft dimensions are not measured and compensated, then the process is simple, but manufacturing precision deteriorates due to non-circular rotation and misalignment
Solution Approach 1:
The system replaces mechanical measurement methods with optical measurement using laser emitter and photo-electric detector. This substitution enables non-contact, high-precision measurement of substrate inner diameter and shaft diameter, achieving measurement precision that exceeds conventional mechanical methods
Solution Approach 2:
The laser emitter and photo-electric detector serve multiple functions: they measure both substrate inner diameter and shaft diameter, calculate the radius difference, and provide data for positioning compensation. This multi-functionality achieves comprehensive dimensional measurement and compensation without adding separate measurement systems
3Manufacturing precision
If stabilizers are added to compensate for alignment errors, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The stabilizers work by adjusting mechanical parameters of the positioning system based on calculated displacement amounts. The system changes the positional parameters of the stage and substrate to compensate for alignment errors, achieving precise concentricity through parameter adjustment rather than complex mechanical restructuring
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 ensures accurate concentric patterning and reduces misalignment issues, enhancing the quality and consistency of patterned features on substrates, particularly in applications like hard disk drives, by accounting for variations in substrate and shaft dimensions.
Implementation Method 1
a laser emitter and photo-electric detector to determine the inner diameter of the substrate
Implementation Method 2
laser emitter and photo-electric detector to determine the inner diameter of the substrate
Implementation Method 3
laser emitter and photo-electric detector to determine the inner diameter of the substrate
Data Source
AI summary
Systems and methods for imprinting a patterned layer on a substrate are described. Features of patterned layer may be concentrically imprinted in relation to a shaft positioned on a substrate chuck. The substrate may be biased using a radius difference between a diameter of the shaft and an inner diameter of the substrate in relation to a point on an inner edge of the substrate.