Nanoimprint Replica Template Inspection via Plane Wave Scattering
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Solution Overview
Problem
The existing methods for manufacturing and inspecting replica templates in nanoimprinting are inefficient, leading to low productivity and lengthy inspection times, which hinder the mass production of high-precision templates.
Innovation Solution
A method involving resin-film formation, imprinting, etching, and protective-layer management for template production, combined with a plane-wave inspection technique using an inspection light source and detection system to rapidly identify defects in replica templates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If replica templates are inspected one by one via electron microscope or scattered light method, then inspection precision can be maintained, but inspection time becomes excessively long
Solution Approach 1:
The patent segments the inspection process by separating the template from the substrate and inspecting them independently. The template is removed from the substrate before inspection, allowing the inspection system to focus solely on the template structure without being constrained by substrate interference or requiring complex multi-layer imaging, thereby reducing inspection time while maintaining precision
Solution Approach 2:
The patent uses optical scattering information to create a virtual copy or representation of the template structure for inspection purposes. By analyzing the scattering pattern of light interacting with the template, the system can infer structural characteristics without requiring direct high-magnification electron microscopy of the entire template, reducing inspection time while preserving measurement precision
2Manufacturing precision
If conventional inspection methods are used for replica templates, then detailed structure can be observed, but productivity remains low due to lengthy inspection processes
Solution Approach 1:
The inspection method is segmented to focus only on critical template features rather than inspecting the entire template-substrate assembly in detail. By separating template inspection from substrate inspection and using scattering-based rapid screening, the system maintains precision for template-critical dimensions while dramatically reducing overall inspection time to enable mass production
Solution Approach 2:
The patent replaces mechanical electron beam scanning with optical scattering measurement for template inspection. This substitution eliminates the time-consuming nature of electron microscope scanning while maintaining sufficient precision for template quality control, thereby enabling high-volume template production
3Productivity
If multiple replica templates are produced using master template, then mass producibility is improved, but ensuring correspondence between replica templates and master template becomes more difficult
Solution Approach 1:
The patent uses optical scattering patterns as copies or fingerprints of the template structure to verify correspondence between master and replica templates. By comparing scattering patterns rather than performing detailed dimensional measurements of each feature, the system can rapidly verify that replicas accurately reproduce the master template structure, maintaining precision while enabling mass production
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 significantly enhances the mass producibility of replica templates and reduces inspection time, enabling faster and more accurate production of high-precision templates for nanoimprinting.
Implementation Method 1
an irradiating step for irradiating inspection light of plane waves to the master template and the replica template; and a detecting step for detecting light of a component different from the plane waves
Data Source
AI summary
There is provided a template inspection apparatus which inspects a replica template, manufactured by an imprinting method from a master template having a depression/protrusion pattern, the template inspection apparatus including: an inspection light source part which radiates inspection light of plane waves; a stage configured to dispose the master template and the replica template so as to be in close proximity with each other and be irradiated by the inspection light; and a detection part which detects light of a component transmitting through the master template and the replica template and different from the plane waves. Accordingly, a template can be inspected in a short time.