Heat-Shrink Diffraction Grating for Sub-Wavelength Groove Fabrication
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Solution Overview
Problem
Existing methods struggle to manufacture diffraction gratings with sub-wavelength structures due to resolution limits in photolithography, etching, or mechanical cutting, leading to difficulties in achieving fine grating grooves required for high diffraction efficiency and sensitivity in spectrometric applications.
Innovation Solution
A method involving the transfer of a diffraction grating pattern onto a heat-shrinkable resin, followed by heating and shrinking to achieve finer grating structures, and subsequent transfer to a transparent resin or metal film, utilizing solvent-based peeling and plating processes to enhance precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography, etching, or mechanical cutting is used to manufacture diffraction gratings, then the manufacturing process is straightforward and reliable, but the resolution limit prevents achieving sub-wavelength fine grating structures
Solution Approach 1:
A mold with microstructure is introduced as an intermediary tool to transfer the fine grating pattern onto the resin base member. The mold acts as a mediator that bridges the gap between what can be manufactured with conventional processes and the desired sub-wavelength precision, enabling high-resolution patterning without requiring equally high-resolution manufacturing processes
Solution Approach 2:
The fine grating pattern is copied from the mold to the resin base member through contact transfer. By creating a replica of the mold's microstructure on the resin surface, the invention achieves precise grating patterns that would be difficult to manufacture directly, effectively using copying to overcome manufacturing resolution limits
2Manufacturing precision
If heat-shrinkable resin is bonded and shrunk to achieve finer groove pitch, then the grating fineness is improved, but warpage occurs due to shrinkage factor differences between layers
Solution Approach 1:
The shrinkage function is extracted and concentrated into a dedicated heat-shrinkable resin layer, while the grating pattern formation is handled by the mold transfer process. This separation allows the shrinkage to occur uniformly in a controlled layer without compromising the flatness of the overall grating structure, as the pattern transfer happens before shrinkage
Solution Approach 2:
The grating pattern is transferred onto the heat-shrinkable resin before the shrinking process occurs. By performing the pattern transfer in advance, the resin can then be uniformly shrunk without distorting the already-formed pattern, preventing warpage while achieving finer groove pitch
3Manufacturing precision
If water-absorbent polymer resin is used and moisture is volatilized to shrink the mold, then fine optical element patterns are achieved, but dimension variation occurs due to changes in shrinkage factor
Solution Approach 1:
The invention changes the shrinkage mechanism from moisture-based (chemical) to heat-based (physical). By using heat-shrinkable resin that responds to temperature changes rather than moisture content, the shrinkage becomes more controllable and predictable, reducing dimension variation while maintaining the ability to achieve fine patterns
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 the fabrication of diffraction gratings with grating grooves finer than the processable limit, improving diffraction efficiency and sensitivity of analysis devices.
Implementation Method 1
the heat-shrinkable resin is heated and caused to shrink
Implementation Method 2
the diffraction grating spectrally disperses the light into light at respective wavelengths
Data Source
Figure 1~3
Figure 4~6
Figure 7~8(f)
AI summary
Provided is a diffraction grating having grating grooves finer than a processable limit of existing semiconductor processing or machining. A diffraction grating to be mounted on an analysis device, in which a diffraction grating pattern formed on a substrate is transferred onto a heat-shrinkable resin, the heat-shrinkable resin is heated and caused to shrink, and the diffraction grating pattern on the heat-shrinkable resin thus shrunk is transferred onto a transparent resin or a metal film.