Imprint Lithography Stamp With Integrated Diffuser Structure
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Solution Overview
Problem
In imprint lithography, obstacles between the light source and curable resin, or nonuniformities in the light source, lead to uneven curing, resulting in uncured and cured areas. Increasing the light dose can mitigate this but may cause overcuring and resin damage such as cracking.
Innovation Solution
A stamp for imprint lithography that is at least partially transparent to electromagnetic radiation and incorporates a diffuser structure, such as microparticles or nanoparticles, to diffuse the radiation as it passes through, ensuring even curing of the resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the total dose is increased to mitigate uneven curing, then the curing completeness is improved, but overcuring occurs causing resin damage
Solution Approach 1:
The stamp incorporates a diffuser structure with specific optical properties that selectively modify light distribution in different regions. The diffuser structure creates locally optimized light intensity patterns, allowing uniform curing across the resin surface without requiring excessive total dose, thereby preventing overcuring damage.
Solution Approach 2:
The diffuser structure acts as an intermediary between the light source and the curable resin. It mediates the light distribution by scattering and redistributing the electromagnetic radiation, ensuring uniform energy delivery to the resin while preventing localized overexposure that would cause damage.
2Device complexity
If obstacles are present between light source and resin, then the stamp structure is simplified, but uneven curing occurs
Solution Approach 1:
The diffuser structure is integrated directly into the stamp body, merging the patterning function and the light diffusion function into a single component. This eliminates the need for separate diffuser elements while achieving uniform curing, thus maintaining device simplicity while improving manufacturing precision.
Solution Approach 2:
The stamp is constructed as a composite structure combining patterning material with diffusing material. This composite design allows the stamp to simultaneously define the desired shape and diffuse light uniformly, resolving the contradiction between structural simplicity and curing uniformity.
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 use of a diffuser-stamped approach reduces uneven curing of the curable resin, minimizing the risk of overcuring and resin damage, while also eliminating the need for separate diffusers or diffusers in the light source.
Implementation Method 1
the stamp comprises at least one diffuser structure for diffusing the electromagnetic radiation as the electromagnetic radiation propagates through the stamp
Data Source
AI summary
According to an embodiment, a stamp for imprint lithography defines a desired shape for a curable resin, wherein the stamp is at least partially transparent to electromagnetic radiation used to cure the curable resin, and wherein the stamp comprises at least one diffuser structure for diffusing the electromagnetic radiation as the electromagnetic radiation propagates through the stamp.