Laser Metric Calculation for Lithographic Apparatus Spectrum Control
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Solution Overview
Problem
Lithographic apparatuses face challenges in accurately projecting patterns onto substrates due to limitations in controlling the spectrum of laser radiation, affecting the precision and quality of the imaging process.
Innovation Solution
A control module calculates laser metrics based on the spectrum of laser radiation and the representation of the aerial image of the pattern to be projected, adjusting the operation of the laser and lithographic apparatus to optimize the spectrum for improved pattern projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the spectrum of laser radiation is not controlled, then the lithographic apparatus can operate with simpler control mechanisms, but the pattern projection accuracy and imaging quality deteriorate
Solution Approach 1:
The system performs preliminary calculation of laser metrics based on the spectrum and aerial image representation before actual pattern projection. This allows optimization of laser parameters in advance, ensuring accurate pattern projection without requiring complex real-time control mechanisms during the exposure process.
Solution Approach 2:
The control module calculates laser metrics by analyzing the relationship between the laser spectrum and the aerial image, then uses this information to adjust laser operation parameters. This feedback mechanism enables precise control of pattern projection accuracy while maintaining manageable system complexity through intelligent parameter adjustment.
2Measurement precision
If the laser spectrum is adjusted to improve pattern projection quality, then the imaging precision improves, but the complexity of laser control increases
Solution Approach 1:
The system optimizes imaging precision by calculating and adjusting laser spectral parameters based on the aerial image requirements. The control module modifies laser operation parameters such as wavelength and bandwidth to achieve optimal imaging quality while managing control complexity through systematic parameter optimization.
Solution Approach 2:
The laser metrics are calculated in advance based on the spectrum and aerial image representation, allowing the system to pre-determine optimal laser parameters before actual pattern projection. This preliminary calculation reduces the complexity of real-time laser control during exposure.
3Manufacturing precision
If laser metrics are calculated and used to modify laser operation, then the pattern projection accuracy improves, but the processing time increases
Solution Approach 1:
The laser metrics calculation is performed as a preliminary step before pattern projection, allowing the system to optimize laser parameters in advance. This upfront calculation ensures accurate pattern projection while minimizing time loss during the actual exposure process by avoiding iterative adjustments.
Solution Approach 2:
The laser system uses calculated metrics to automatically adjust its own operation parameters without requiring extensive external intervention or iterative tuning. This self-adjustment capability reduces processing time by eliminating manual optimization cycles while maintaining high pattern projection accuracy.
Data Source
AI summary
Embodiments of the invention related to lithographic apparatus and methods. A lithographic method comprises calculating a laser metric based on a spectrum of laser radiation emitted from a laser to a lithographic apparatus together with a representation of an aerial image of a pattern to be projected onto the substrate by the lithographic apparatus, and using the laser metric to modify operation of the laser or adjust the lithographic apparatus, and projecting the pattern onto the substrate.