Concave Diffraction Grating Groove Alignment via Intermediary Substrate
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Solution Overview
Problem
Conventional manufacturing methods for concave diffraction gratings with unevenly spaced grooves face challenges in accurately matching the groove interval and position on a curved substrate, leading to variations in the groove pattern shape and reduced image forming capability.
Innovation Solution
A method involving the formation of alignment marks on both the metal thin film and convex fixing substrate, allowing for precise alignment and matching of the groove interval and curved surface during the fabrication of a master concave diffraction grating, ensuring high accuracy in image forming capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a soft material is used to form the groove pattern and then transferred to a curved substrate, then the manufacturing process is simplified, but the groove pattern shape varies significantly
Solution Approach 1:
A rigid intermediate substrate is introduced between the groove pattern formation and final curvature application. The groove pattern is first formed on the rigid substrate, then the entire assembly is curved together, ensuring the groove pattern geometry is preserved while achieving the required curved configuration.
Solution Approach 2:
The groove pattern is formed and fixed on the rigid substrate before the curvature is applied. This preliminary formation ensures that the groove geometry is established in a stable, rigid environment where precise dimensional control is possible, before the final curved configuration is achieved.
2Shape
If a plane diffraction grating is transferred to a curved fixing substrate, then the curved diffraction grating is obtained, but the groove interval and position cannot be matched accurately
Solution Approach 1:
The rigid substrate serves as an intermediary that maintains the groove pattern's geometric integrity during the curvature application process. This allows the groove interval and position to be precisely controlled relative to the curved surface, as the rigid substrate provides a stable reference framework.
Solution Approach 2:
The substrate rigidity parameter is changed from flexible/soft to rigid, which fundamentally alters how the groove pattern responds to curvature. This parameter change enables precise maintenance of groove interval and position relationships while achieving the desired curved shape.
3Reliability
If unequal groove intervals are used to achieve high image forming capability, then the image forming performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The rigid substrate acts as a stable intermediary that simplifies the manufacturing of unequal groove intervals. Once the groove pattern is formed on the rigid substrate, the entire pattern can be curved as a single unit, reducing the manufacturing complexity compared to forming each groove position independently on a curved surface.
Solution Approach 2:
The unequal groove intervals are established in advance on the rigid substrate before curvature is applied. This preliminary arrangement of grooves at precise unequal intervals simplifies the overall manufacturing process, as the complex groove pattern is created in a stable, controllable environment before the final curved configuration is achieved.
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 manufacturing of concave diffraction gratings with high image forming capability by accurately matching the groove interval and curved surface, enhancing the precision and performance of the diffraction grating.
Implementation Method 1
a metal thin film is formed on a plane diffraction grating
Implementation Method 2
an alignment mark forming pattern is formed on a plane diffraction grating
Data Source
Figure 1~1(h)
Figure 2~2(f)
Figure 3A~3B
AI summary
Easy and accurate mating of a groove interval of a groove pattern of a diffraction grating with a position on a convex fixing substrate is enabled. For this purpose, a concave diffraction grating 115 is fabricated by: transferring a groove pattern 103 formed on a plane diffraction grating 101 and having unequal groove intervals onto a metal thin film 105; forming a first alignment mark 109 on a convex surface of a fixing substrate 108 having the convex surface to fix the metal thin film 105; mating a second alignment mark 106 formed on an adhesive surface of the metal thin film 105 with the first alignment mark 109 to perform alignment; bonding the adhesive surface of the metal thin film and the convex surface of the fixing substrate to each other to fabricate a master 110; and transferring a groove pattern of a metal thin film of the master 110.