Imprint Lithography Contact Line Motion Tracking Control
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Solution Overview
Problem
Current nano-fabrication techniques in imprint lithography face challenges in achieving precise control over contact transition and conforming of templates to substrates, leading to inefficiencies in pattern transfer and potential overlay distortions during the imprinting process.
Innovation Solution
A lithographic system with a controlled contact system that adjusts the distance and force between the template and substrate using a multivariable tracking strategy, combined with a fluid dispense system and energy source, to ensure precise contact and conforming, reducing air resistance and back pressure, and employing a control system with feedback mechanisms to minimize overlay distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional imprint lithography is used without contact line motion tracking control, then the process is simpler, but manufacturing precision deteriorates due to overlay distortions and non-uniform pattern transfer
Solution Approach 1:
The patent implements a feedback control system that tracks the contact line motion between template and substrate in real-time. Sensors detect the actual contact line position and feed this information back to a controller, which adjusts the imprint head position to maintain desired contact line velocity. This closed-loop feedback mechanism ensures uniform pattern transfer by compensating for variations in contact transition, directly resolving the technical contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The patent transitions from static contact control to dynamic contact line motion tracking. By continuously monitoring and controlling the velocity of the contact line during the imprinting process, the system adapts to real-time variations in template-substrate contact. This dynamic approach enables precise control over the conforming process, improving pattern transfer uniformity while managing the increased control system complexity through automated tracking algorithms.
2Manufacturing precision
If contact transition is not precisely controlled, then the process is faster, but manufacturing precision deteriorates due to overlay distortions
Solution Approach 1:
The feedback control system continuously monitors contact line position and velocity, providing real-time information to adjust the imprint head motion. This enables precise control over the contact transition phase, ensuring uniform conforming between template and substrate without introducing overlay distortions. The automated feedback mechanism maintains high manufacturing precision while optimizing the imprinting cycle time by eliminating the need for conservative slow-downs.
3Manufacturing precision
If multivariable tracking control is implemented, then manufacturing precision improves through reduced overlay distortions, but device complexity increases
Solution Approach 1:
The multivariable tracking control system employs multiple sensors to monitor various parameters including contact line position, velocity, and template-substrate gap. This comprehensive feedback information is processed by a controller that coordinates multiple actuators to maintain precise contact control. The systematic integration of multiple feedback loops and control variables achieves superior manufacturing precision while managing device complexity through modular control architecture and automated algorithms.
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 precise control over the contact transition and conforming process, improving the uniformity of the pattern transfer and reducing overlay distortions, thereby enhancing the accuracy and efficiency of the nano-fabrication process.
Implementation Method 1
a spread camera may be used to determine the position of the contact line
Implementation Method 2
A lithographic system with a controlled contact system that adjusts the distance and force between the template and substrate using a multivariable tracking strategy
Data Source
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Figure 3A~3B
Figure 3C~3D
AI summary
Systems and methods for controlling velocity of a contact line and height profile between a template and a substrate during imprinting of polymerizable material are described.