Rectangular Substrate Rotary Polishing for Imprint Lithography
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Solution Overview
Problem
In imprint lithography, rectangular substrates require high shape accuracy and flatness of side surfaces to ensure precise compression and pattern control, but existing substrates often fail to meet these standards, leading to distortion and defects in pattern transfer.
Innovation Solution
A method involving rotary polishing of rectangular substrates to achieve side surface flatness of up to 20 μm and orthogonal angles between surfaces, with controlled polishing speeds and directions to maintain high accuracy and surface roughness, and optional grinding and polishing of back surfaces for improved handling and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional substrate manufacturing methods are used, then manufacturing cost is reduced, but side surface flatness and shape accuracy deteriorate
Solution Approach 1:
The substrate side surfaces are ground and polished to predetermined flatness specifications before the imprint lithography process begins. This preliminary preparation ensures that when the substrate is later compressed by the actuator system, the force is uniformly distributed and the pattern transfer accuracy is maintained without requiring complex real-time adjustments during operation.
Solution Approach 2:
The patent replaces conventional mechanical machining methods with a combination of grinding and polishing processes. This substitution achieves superior surface flatness and optical quality that cannot be obtained through traditional mechanical means alone, while maintaining manufacturing feasibility through standardized process sequences.
2Manufacturing precision
If actuator system compression is applied to substrates with poor flatness, then device complexity is reduced, but pattern shape control accuracy deteriorates
Solution Approach 1:
The substrate side surfaces are ground and polished to predetermined flatness specifications before the imprint lithography process begins. This preliminary preparation ensures that when the substrate is later compressed by the actuator system, the force is uniformly distributed and the pattern transfer accuracy is maintained without requiring complex real-time adjustments during operation.
3Manufacturing precision
If substrate side surfaces are not sufficiently flat, then ease of operation is improved, but compression force distribution deteriorates
Solution Approach 1:
The substrate side surfaces are ground and polished to predetermined flatness specifications before the imprint lithography process begins. This preliminary preparation ensures that when the substrate is later compressed by the actuator system, the force is uniformly distributed and the pattern transfer accuracy is maintained without requiring complex real-time adjustments during operation.
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
The method enables high-accuracy compression and pattern shape control, allowing for the precise transfer of complex patterns with fine features to recipient substrates, reducing defects and improving pattern alignment.
Implementation Method 1
pressing a rotary polishing pad perpendicularly against one side surface of the substrate under a constant pressure, and relatively moving the rotary polishing pad and the substrate parallel to the side surface, for thereby polishing the side surface of the substrate
Data Source
AI summary
A rectangular substrate is prepared by providing a starting rectangular substrate having front and back surfaces and four side surfaces as ground, and pressing a rotary polishing pad perpendicularly against one side surface under a constant pressure, and relatively moving the rotary polishing pad and the substrate parallel to the side surface, for thereby polishing the side surface of the substrate. In the imprint lithography, the rectangular substrate is capable of controlling compression and pattern shape at a high accuracy and thus transferring a complex pattern of fine feature size to a recipient.